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A.J. Puk

D-backs Expected To Target Young Pitching At Deadline

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The Diamondbacks enter the unofficial second half of the season with a 47-50 record  that has them buried by 11 games in the NL West and sitting 5.5 games out of the final NL Wild Card spot (with four teams to leapfrog to get there). General manager Mike Hazen said two weeks ago that he hopes the team puts him in a position to buy at the trade deadline. The team has gone 4-8 since he made those comments. FanGraphs gives the Diamondbacks just a 10.2% chance to make the postseason. Baseball Prospectus is ever so slightly more charitable at 11.3%. The D-backs open the second half with a three-game series against a 51-46 Cardinals team. They follow that with three against a last-place Pirates squad but then face a pair of first-place clubs — Tigers, Astros — in the final stretch leading to the trade deadline.

Suffice it to say, the outlook for 2025 isn’t great. Hazen spoke with Nick Piecoro of the Arizona Republic at this week’s All-Star festivities and acknowledged that the Snakes “are running out of time” and that they would “need to play pretty exceptional” baseball to get back into a buy position prior to the deadline. Hazen also conceded that he’s been fielding inquiries from clear buyers already but naturally wouldn’t commit one way or another when asked about his willingness to make a move well ahead of the July 31 deadline.

[Related: Arizona Diamondbacks Trade Deadline Outlook]

Arizona isn’t short on marketable assets, even if the goal is to hang onto players controlled beyond the current season. Corner infielders Eugenio Suárez and Josh Naylor would be two of the best bats on the market. Suárez was plunked on the hand in last night’s All-Star Game but remained in the contest. Postgame x-rays were negative. Randal Grichuk would be a nice role player for a team looking for a right-handed bat with a long track record versus lefties.

On the pitching side of things, Zac Gallen has struggled all season but has an excellent track record. He looked to be turning a corner with terrific starts on July 1 and 7 (combined 13 innings with one run on 10 hits and a 19-to-1 K/BB ratio) before being rocked for six runs in his final start prior to the break. Merrill Kelly (3.34 ERA in 116 frames) has been strong all season, though, as have relievers Jalen Beeks and Shelby Miller. Both Beeks and Miller are on the injured list — the latter due to a forearm strain on which he is ominously seeking a second opinion. If one or both returns in timely fashion, they’d be obvious trade targets for clubs seeking affordable bullpen help.

It’s at least possible the Diamondbacks will listen on more controllable players. They’re reportedly listened on their outfield depth. Corbin Carroll isn’t going anywhere, but each of Alek Thomas, Jake McCarthy, Lourdes Gurriel Jr. and Grichuk could hold varying levels of appeal.

If the D-backs do end up as a seller, which seems likely, Piecoro suggests they’ll prioritize adding pitching they can control beyond the current season. That’s only logical with Corbin Burnes facing a lengthy recovery from Tommy John surgery and both Kelly and Gallen hitting free agency at season’s end. Lefties Blake Walston and Tommy Henry also had UCL surgeries this season — Walston in March, Henry in June. Young righty Cristian Mena is on the 60-day IL due to a shoulder strain. The injury problems extend to the bullpen, where top relievers Justin Martinez and A.J. Puk had Tommy John surgery just last month.

Looking ahead to the Diamondbacks’ 2026 rotation mix, they’ll have Brandon Pfaadt, Eduardo Rodriguez and Ryne Nelson all locked into spots. The former two have struggled to ERAs north of 5.00 this season. Nelson has a 3.68 ERA in 78 1/3 innings. Other in-house options, like 24-year-old righty Yilber Diaz (one of their top prospects entering the season) and 27-year-old Bryce Jarvis, have had nightmare seasons in Triple-A. Diaz currently has an ERA north of 11.00.

Given the broad-reaching slate of injuries and departing free agents, it’s sensible to focus on pitching help to the extent possible. That doesn’t mean the D-backs will turn away offers that include enticing young hitters to take on lesser pitchers, but if two packages of comparable quality are offered up, the D-backs seem likely to favor one that skews toward the pitching side of things.

Of course, the D-backs needn’t focus entirely on rebuilding their staff in the next two weeks. They have nearly $75MM in salary set to come off the books via free agency and could save further money via trades in the next two weeks. Their arbitration class isn’t large, and one of their most notable arbitration salaries (Puk) could come off the books via non-tender. His UCL surgery was just last month, and 2026 is Puk’s final season of club control. There should be ample space — and need — to pursue help both in the rotation and the bullpen this offseason.

A.J. Puk Undergoes Elbow Surgery; Gabriel Moreno Diagnosed With Fractured Finger

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June 21: MLB.com’s Steve Gilbert reports that A.J. Puk underwent internal brace surgery and not a Tommy John procedure. Tommy Henry, however, will require Tommy John. Gilbert adds that Justin Martinez, another D-backs pitcher in need of Tommy John surgery, will have his operation performed next week.

June 20: Diamondbacks reliever A.J. Puk underwent elbow surgery today, manager Torey Lovullo tells the Burns & Gambo show. Puk had visited Dr. Neal ElAttrache after experiencing recurring soreness as he tried to work back from a flexor strain. Lovullo didn’t have specific details as to whether he required a full Tommy John ligament replacement or some kind of modified internal brace procedure. Puk’s season is over in either case. He’s likely to miss most or all of 2026 as well.

Additionally, the manager told Burns & Gambo that catcher Gabriel Moreno has a hairline fracture in his right index finger. The D-Backs placed Moreno on the 10-day injured list yesterday but had initially called it a hand contusion. He has evidently been playing through an undiagnosed fracture for some time. A return timetable is unclear but will be measured in “weeks, not days.” Topping it all off, Nick Piecoro of The Arizona Republic reports that left-hander Tommy Henry is also headed for season-ending elbow surgery.

The news on Puk is terrible but unsurprising. He has been plagued by elbow issues for the past two months. He’d undergone Tommy John surgery once before in his career. The 6’7″ southpaw required the procedure in 2018 when he was a member of the A’s farm system. He missed that season and was limited to 28 combined appearances between the minors and MLB the following year.

Acquired from the Marlins at the 2024 deadline, Puk has been one of the most dominant relievers in the sport since getting to Arizona. He recorded 43 strikeouts in 27 1/3 innings after the trade last summer, working to a 1.32 ERA in the process. He had fanned 12 more hitters against two walks while collecting four saves in his first eight appearances this year. Aside from a terrible stint in Miami’s rotation early last season, he has been generally excellent since the A’s traded him to Miami over the 2022-23 offseason.

Depending on the nature of the surgery, there’s a decent chance this will end his time with the D-Backs. Puk has over five years of MLB service. He’ll be eligible for arbitration for the final time next offseason. He’d earn only a modest raise on this year’s $2.95MM salary, but a full ligament repair would make him a non-tender candidate. Players usually require 14-plus months to return from Tommy John surgery, and that would be Puk’s second such procedure. He’s likely to be out through next year’s All-Star Break even if he “only” needed the internal brace procedure, though the D-Backs would happily retain Puk for around $3MM if they felt they could get half the season from him.

The news on Puk comes a week after the news that Justin Martinez, the team’s other top reliever, also needs to go under the knife. Corbin Burnes and Jordan Montgomery have been Tommy John victims in the rotation. It’s difficult for any team to weather that kind of injury luck. Arizona has hovered around .500 despite having an elite offense because of their issues on the mound.

They’ll lose Moreno from that lineup for what seems like a decent chunk of time. There’s a significant drop off to light-hitting backup Jose Herrera. The Snakes selected Aramis Garcia to work off the bench behind Herrera. Adrian Del Castillo is the only other catcher on the 40-man roster. He’s a far better hitter than either Herrera or Garcia but isn’t regarded as a great defender. Del Castillo won’t be an option in the immediate future regardless, as he landed on the Triple-A injured list today with what is expected to be a minor back injury. Moreno will be the clear starting catcher once he’s healthy, but his injury could lead the Snakes to pursue a veteran #2 who can provide more punch than Herrera offers.

Henry, 27, is a former second-round pick who has a 5.07 ERA over 37 career appearances. He has an ERA above 8.00 over 11 starts in Triple-A Reno this year. This is his final minor league option season and he seems unlikely to stick on the 40-man roster throughout the offseason. His elbow injury occurred in Triple-A, so he’s on the minor league injured list. He’ll continue to count against the 40-man for now. The D-Backs may place him on the MLB 60-day IL or simply decide to release him (which would save them a bit of money relative to putting him on the MLB injured list) once they need another roster spot.

A.J. Puk Halts Throwing Program With Elbow Discomfort

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Diamondbacks reliever A.J. Puk has paused his throwing program after experiencing renewed elbow soreness, manager Torey Lovullo told reporters on Friday (link via Nick Piecoro of The Arizona Republic). Puk will visit Dr. Neal ElAttrache before deciding on next steps. Lovullo called it “slight discomfort” and noted that the star southpaw initially hoped he could continue throwing through it.

Puk has been out since the middle of April with a flexor strain. The organization has remained hopeful that he’ll be able to rehab the injury without requiring surgery. That’s presumably still the case, but any kind of setback for a forearm/elbow injury is worrisome. That’s especially true considering Puk has a 2018 Tommy John surgery on his medical chart. Even if the follow-up visit goes well, the shutdown will push back his return timeline to some extent.

It’s the latest bad news for a reeling Arizona bullpen. Puk and Justin Martinez were supposed to serve as Lovullo’s 1-2 punch in the late innings. Puk made eight appearances before his IL stay. Martinez got into 17 games and suffered an elbow injury of his own last week. That one immediately proved serious, and the team announced this evening that he’s headed for the second elbow surgery of his career.

Arizona’s bullpen has been a huge weakness. They entered play tonight with a 5.21 earned run average that ranks 27th in MLB. The injuries to Puk and Martinez are the biggest factors, but they’ve also seen former key contributors Ryan Thompson and Kevin Ginkel struggle through rough years. Low-cost acquisitions Shelby Miller and Jalen Beeks have been their most reliable relievers. The D-Backs will need to acquire multiple bullpen arms if they’re in position to add at the deadline.

Diamondbacks Place Justin Martinez On 15-Day IL, Transfer A.J. Puk To 60-Day IL

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The D-backs announced Thursday that they’ve placed closer Justin Martinez on the 15-day injured list due to right shoulder inflammation. Lefty Jose Castillo’s contract was selected from Triple-A Reno to take his spot on the active roster. Fellow southpaw A.J. Puk moves from the 15-day IL to the 60-day IL to create 40-man roster space for Castillo.

Martinez was set for an MRI this morning after experiencing an alarming velocity drop over the past week. He’s gone from averaging triple digits on his power sinker to sitting just 93.5 mph in his most recent appearance. Though the right-hander claimed he felt 100% healthy, he’ll head to the injured list with a still-vague injury designation. The D-backs will surely provide more information on his status and potential timeline later today.

This slate of injury-related moves is a brutal blow for a D-backs team that spent much of the offseason looking for established bullpen arms but wound up making generally smaller-scale moves. Martinez and Puk are the team’s two best relievers and entered the year as the favorites to work in save and high-leverage hold situations. They’re both on the shelf, and while Puk’s flexor strain won’t require surgery, today’s move to the 60-day IL only further underlines the fact that Arizona is going to be without him for quite some time.

Martinez, 23, averaged 100.2 mph on his sinker in 2024 and averaged better than 100 mph on the pitch in each of his first eight appearances this year. A dip into the 97-99 mph range over his next three outings was concerning but not necessarily cause for full-fledged alarm. Last night’s drop all the way to 93.5 mph, in an outing where he faced three hitters and allowed two walks and a home run, is another story entirely.

It’s become an ominous situation for D-backs fans to monitor, and one that’s compounded by Puk’s absence. Martinez broke out with a 2.48 ERA, 29.5% strikeout rate, 11.7% walk rate, 58.9% ground-ball rate, eight saves and seven holds across 72 2/3 innings for the Snakes last year. He clearly has some command issues, but the elite velocity coupled with plus strikeout and ground-ball rates helped to mitigate that bloated walk rate.

The D-backs, clearly bullish on Martinez’s future, signed him to a five-year, $18MM extension during spring training. The contract contains a pair of club options for the 2030-31 seasons, which would’ve been Martinez’s first two free agent years. At the time, there was little reason to fear an injury (beyond the general attrition rate of pitchers in today’s game). Now, the outlook is far hazier.

Were Puk healthy, the Diamondbacks would surely have just plugged him into the closer’s role and moved forward with Kevin Ginkel setting up. But Puk hit the injured list with elbow inflammation after a strong eight-inning start to his 2025 season, and a subsequent MRI revealed a flexor strain that’ll require a notable shutdown period.

With Martinez and Puk both shelved, the D-backs will likely turn closing duties over to a combination of Ginkel and Shelby Miller, who returned to Arizona on a minor league deal this offseason and has been outstanding after earning a job this spring. Ginkel only just returned from his own bout of shoulder inflammation, which sidelined him for the first month of the season. From 2022-24, he pitched a combined 164 2/3 innings with a 2.95 ERA, 26.1% strikeout rate and 7.9% walk rate. Miller has pitched 12 2/3 scoreless innings in his return to Phoenix, punching out a gaudy 31.9% of opponents against an 8.5% walk rate.

The 29-year-old Castillo isn’t likely to replicate the type of results that could’ve been expected from either Martinez or Puk, but he’s a reasonably experienced southpaw who’s had some prior success in the majors. Back in 2018-19, the southpaw looked to be breaking out as a viable bullpen arm for the division-rival Padres, pitching to a combined 3.23 ERA with a 35% strikeout rate and 8.4% walk rate in his first 39 big league innings.

Injuries have blown up Castillo’s career since. He suffered a torn ligament in his hand that cut his 2019 season short. A torn lat wiped out his 2020 season. He underwent Tommy John surgery in 2021 and missed most of the 2022 season as a result. It’s a staggering run of unfortunate maladies for the southpaw, but he’s shown some encouraging signs since joining the D-backs on a minor league deal last year.

In 24 innings between Arizona’s Rookie-ball and Triple-A affiliates last year, Castillo notched a 3.75 ERA. He whiffed 24.1% of his opponents and issued walks at an 8.1% clip with Triple-A Reno. This year, he’s started out by holding opponents to a run on four hits and no walks with seven strikeouts in 5 1/3 frames. Castillo has had an arduous grind to get back to the majors after pitching just two MLB frames from 2019-23. He’s now poised for his first real look in a bullpen since 2018, despite accumulating four years of MLB service time through his various stints on the 60-day injured list.

Because he only has four years of service, Castillo could be a multi-year option for Arizona if he can get back to his early career form. Enough time has already elapsed that he won’t be able to reach five years of service before the conclusion of the 2025 season. That means even if he’s back in the majors for good — and that’s far, far from certain — he can be controlled through the 2027 campaign via arbitration.

A.J. Puk Shut Down With Flexor Strain, Not Expected To Require Surgery

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D-Backs southpaw A.J. Puk has been diagnosed with a flexor strain, reports Nick Piecoro of The Arizona Republic. He’ll remain shut down from throwing for 2-3 weeks before going for reevaluation. Fortunately, the team does not believe the injury will require surgery.

It’s moderately encouraging news after last week’s revelation that Puk was seeking multiple opinions on his elbow injury. He went on the 15-day injured list on April 19 and almost immediately went for imaging. That obviously raised the possibility of surgery, but it seems he’ll avoid the worst-case scenario.

That said, he’s clearly going to be out for an extended stretch. Puk will not resume throwing until the middle of May at the earliest. He’ll surely require a multi-week build from there. He won’t be back on an MLB mound before June, and there’d seem to be a decent chance he’s out beyond the All-Star Break. Puk has a previous Tommy John procedure on his medical chart. He underwent the surgery while he was a prospect in the A’s system back in 2018.

Acquired from Miami at last year’s deadline, Puk has been brilliant for the Diamondbacks. He posted a 1.32 ERA with 43 strikeouts in just 27 1/3 innings down the stretch. He’d reeled off another eight frames of three-run ball with 12 punchouts this season. He recorded four saves and two holds without surrendering a lead over the first three weeks.

Puk’s absence puts greater pressure on Justin Martinez to cement himself as Torey Lovullo’s top late-game weapon. The fireballer has worked 10 innings of two-run ball with 11 punchouts and a massive 61.9% grounder rate. Shelby Miller, Kevin Ginkel, Jalen Beeks and Ryan Thompson are among the setup group.

D-Backs Notes: McCarthy, Barrosa, Puk, Alexander

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The Diamondbacks are optioning Jake McCarthy to Triple-A Reno, per the MLB.com transactions log. John Gambadoro of 98.7 FM in Phoenix suggests that Jorge Barrosa is likely to be recalled tomorrow to replace McCarthy in the outfield.

McCarthy has had a terrible start to the season. He has managed just three hits in his first 41 at-bats. The 27-year-old is coming off arguably the best year of his career. McCarthy hit .285/.349/.400 with eight homers and 25 stolen bases through a career-high 495 plate appearances last season. He earned the Opening Day assignment in center field as a result. His slump quickly cut into his playing time, as Alek Thomas has gotten the nod in center for five of the past six contests.

A good contact hitter, McCarthy has continued to put the ball in play. He has only fanned in six of 47 plate appearances, but he’s simply doing no damage. He only has one extra-base knock, a double, with five hard-hit balls (ones with an exit velocity of 95 MPH or better) on the season. McCarthy has never had imposing batted ball metrics, but the results became too much to ignore. He will be able to play every day in Reno rather than work in a fourth outfield role as he tries to get on track.

That’ll seemingly afford an MLB opportunity for the switch-hitting Barrosa. He made a brief major league debut last season, collecting three hits in eight games. He hit .270/.360/.421 over 75 Triple-A games last season. The Venezuela native is out to a stronger start in 2025, batting .295/.362/.495 with a trio of homers over 105 plate appearances in the Pacific Coast League.

Elsewhere on the roster, reliever A.J. Puk is scheduled for an MRI today (link via ESPN’s Jesse Rogers). The southpaw landed on the 15-day injured list on Saturday with inflammation in his throwing elbow. The Snakes will presumably provide a return timeline after getting the imaging results. Puk has been brilliant since the D-Backs acquired him from Miami at last summer’s deadline. He owns a 1.78 ERA with 55 strikeouts through 35 1/3 frames in an Arizona uniform.

On the other side of the injury ledger, Arizona activated Blaze Alexander from the 10-day IL and optioned him to Reno on Sunday. The 25-year-old infielder suffered an oblique strain early in his camp and only appeared in two Spring Training games. He played eight games on a rehab assignment. Rookie Tim Tawa and speedster Garrett Hampson are splitting the second base playing time with Ketel Marte on the injured list. Alexander would probably have gotten those reps had he been fully healthy throughout camp, but he’ll remain in Triple-A for the time being.

Diamondbacks Place A.J. Puk On 15-Day IL

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The Diamondbacks announced several transactions in a shake-up of the club’s bullpen mix today.  The headline news is that closer A.J. Puk has been placed on the 15-day injured list (retroactive to April 18) due to inflammation in his left elbow.  Righty Bryce Jarvis and left-hander Joe Mantiply were optioned to Triple-A, and Arizona filled those three bullpen spots by calling up right-hander Drey Jameson, and selecting the contracts of right-handers Juan Morillo and J.P. Feyereisen.  To create roster space, the D’Backs also designated infielder Grae Kessinger for assignment.

Puk excelled after the Diamondbacks acquired him from the Marlins at last year’s trade deadline, and the southpaw has kept going this year by posting a 3.38 ERA in eight innings this season.  Even with the benefit of an absurd 97.6% strand rate, Puk has backed up his work with an excellent 34.3% strikeout rate and 5.7% walk rate.  In addition to all the swings and misses, Puk isn’t allowing much hard contact when his offerings do find a bat, and he has closed out all four of his save chances this season.

Unfortunately, his strong start has now been interrupted by a trip to the IL.  Puk’s lengthy injury history (which includes a Tommy John surgery) puts some extra focus on any elbow-related ailment, though there isn’t any indication at this point that his current issue is anything more than just inflammation.  Assuming no structural damage, Puk might be able to return after just a 15-day minimum, though it is just a matter of how long his elbow discomfort continues to linger.

Justin Martinez is now the likeliest candidate to step up as the new closer, with Shelby Miller and Jalen Beeks continuing in high-leverage setup roles.  Beeks is also the only southpaw in Arizona’s bullpen now that Mantiply has been sent to Reno.

Arizona’s 13-11 slugfest loss to the Cubs yesterday saw both Jarvis and Mantiply charged with three earned runs apiece, with each reliever throwing two-thirds of an inning.  The demotions to Triple-A can allow both pitchers to gather themselves after a difficult start to their seasons, while the D’Backs can get a few fresher arms into the bullpen.  This means Jameson is now in line to make his first MLB appearance since the 2023 season, Feyereisen will make his D’Backs debut after signing a minor league deal with the team in March, and Morillo is set to make his Major League debut after eight pro seasons.

Jameson last pitched in a big league game on July 6, 2023, as he underwent a Tommy John surgery that September that cost him the entirety of the 2024 campaign.  The 34th overall pick of the 2019 draft had posted a 2.63 ERA over 65 innings during the 2022-23 seasons, starting seven of 19 games but pitching mostly in a relief role as the 2023 season developed prior to his UCL injury.  The righty has worked exclusively out of the pen at Triple-A this season, and he has a 2.70 ERA over 6 2/3 innings in Reno while recording 11 strikeouts against zero walks.

Now that he’s back in good health, Jameson can resume his career and perhaps carve out a firm place for himself within Arizona’s bullpen.  He showed quite a bit of promise as a multi-inning reliever, as his past history as a starter gave him some extra durability coming out of the pen.  The D’Backs could look to deploy Jameson as a long man or a swingman, at least letting him get some innings under his belt before perhaps trying him for higher-leverage work.

The 26-year-old Morillo spent his entire career in the Dodgers organization before joining the D’Backs as a minor league free agent back in November.  Making his Triple-A debut this season, Morillo has thrown 6 1/3 innings of 1.42 ERA ball in Reno, with a 29.6% strikeout rate, 7.4% walk rate, and a huge 68.8% grounder rate to boot.  The latter number stands out even amidst Morillo’s history as a groundball pitcher, and the solid walk rate is also noteworthy given his control problems earlier in his minor league career.

Between his high velocity, strikeout potential, and ability to keep the ball on the ground, there’s plenty to like about Morillo if he can find the consistency that has eluded him for a good chunk of his minors career.  He’ll get a chance to show what he can do against MLB hitters during what might be a cup of coffee in the big leagues, depending on how Arizona chooses to align its bullpen beyond just this weekend.

Feyereisen has a 2.95 ERA over his 100 2/3 career innings in the majors, which covers parts of four seasons with the Brewers, Rays, and Dodgers from 2020-24.  Feyereisen had solid numbers in 2021 and looked to be breaking out as a high-leverage reliever in Tampa’s bullpen in 2022 before a shoulder injury resulted in surgery that cost him the entire 2023 season.

Resurfacing in L.A. last year, he had an 8.18 ERA in 11 innings at the big league level, as Feyereisen clearly still had some rust from his long layoff.  His 0.96 ERA in 9 1/3 innings in Reno this season is much more promising, and it was enough to give Feyereisen a shot with another NL West team as he looks to finally establish himself for steady bullpen work.

Kessinger played all over the infield in a backup capacity with the Astros during the 2023-24 seasons, appearing in 48 total games and hitting .131/.243/.213 in 70 plate appearances.  His career Triple-A slash line of .268/.370/.401 is much more impressive on paper, if undermined by the fact that those seemingly solid numbers are barely average in the hitter-friendly Pacific Coast League.

The Diamondbacks acquired Kessinger in a trade in January but he hadn’t yet seen any action on Arizona’s big league roster, and his tenure with the organization might already be over if he is claimed on waivers or traded.  Kessinger’s trade to Arizona in fact came after the Astros designated him for assignment previously, so history could repeat itself if another infield-needy team comes calling.  If Kessinger clears waivers and is outrighted off the 40-man roster, he must accept the assignment since he doesn’t have the MLB service time or a past outright that would allow him to opt into free agency.

The D-backs’ Closing Competition

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The Diamondbacks entered the offseason in search of a new first baseman, a closer and some right-handed thump in the lineup, among other items on the to-do list. They’ve broadly succeeded, acquiring Josh Naylor from the Guardians to replace free agent Christian Walker and re-signing Randal Grichuk. The Snakes haven’t found a slam-dunk closer, but they signed a new (co) ace, shocking the industry with their signing of Corbin Burnes for six years and $210MM.

While there’s still one marquee free agent reliever on the market — David Robertson has yet to sign — it appears increasingly likely that the Diamondbacks will largely go with the arms who are already in camp as they look to sort out the ninth inning. Arizona’s payroll is already projected for a franchise-record $195MM. That’s a new highwater mark by a measure of nearly $30MM. We can always adopt the “never say never” mentality as long as there are a few viable closing options on the free agent and trade markets, but the D-backs may already have their closer in house. At present, A.J. Puk and Justin Martinez appear to be the front-runners.

Puk, acquired at the deadline from the Marlins in exchange for young slugger Deyvison De Los Santos and outfielder Andrew Pintar, enjoyed a quietly dominant season in 2024. His cumulative 3.15 ERA looks more good than great, but it’s skewed by a failed experiment wherein the Marlins tried to stretch him back out as a starter early in the season. Puk was clobbered for 17 runs in 13 2/3 innings. He moved back to the bullpen, and from that point forth was arguably the best reliever in the sport.

After giving up 17 earned runs in his four starts, Puk only allowed 11 more earned runs for the entire season. He posted a 1.72 ERA out of the bullpen in 2024, fanning a colossal 35% of his opponents against a terrific 5.1% walk rate. Opponents averaged only 86.6 mph off the bat against him in that time with a middling 32.6% hard-hit rate. Per Statcast, only five of his opponents’ batted balls in that time were barreled. Puk allowed a run in his second appearance with the D-backs and then went on a run for the ages, rattling off 23 2/3 scoreless innings with a 38-to-4 K/BB ratio. He punched out 44.7% of opponents in that career-best run.

Martinez was nearly as dominant for the early portion of the 2024 season. The young flamethrower posted a 1.60 ERA with a 27.5% strikeout rate and mammoth 64.5% grounder rate in his first 50 innings of work. His exit velocity and hard-hit rate were nearly identical to Puk’s marks as a reliever. An 11.5% walk rate was in clear need of improvement, but for a 22-year-old who averaged better than 100 mph on both his four-seamer and sinker, it’s hard to draw up a more promising start.

That run of dominance didn’t last the full season, however. While Martinez remained a solid reliever, his 3.90 ERA over the final 27 2/3 innings of his season was far less eye-catching. The young righty’s strikeout rate actually ticked up during that span, perhaps due to roughly doubling the usage of his four-seamer at the expense of his sinker, but his grounder rate fell sharply. There was surely some poor fortune in play, as Martinez was hampered by a .388 BABIP during this stretch despite continuing to limit hard contact (and allowing only one home run).

Whether in the ninth inning or working in a setup capacity, both Puk and Martinez will be in high-leverage roles this season. They were two of the D-backs’ top five arms in terms of their average leverage index — but not the top two. Paul Sewald’s departure in free agency subtracted one of Arizona’s top leverage arms, but it was actually righty Ryan Thompson who found himself most frequently in high-leverage spots, followed by Martinez and then by fellow righty Kevin Ginkel.

The 32-year-old Thompson isn’t the prototypical power arm often associated with pressure-packed, late-inning situations. He’s a sidearming righty who averages just 91 mph on his sinker and 92.5 mph on his lesser-used four-seamer. Thompson’s 19.1% strikeout rate was well below the 23.4% league average among relievers. However, he boasts a 61% grounder rate, rarely issues walks (5.5%) and posted nearly identical results versus righties (.254/.299/.377) and lefties (.254/.293/.377). He picked up two saves and 24 holds.

Ginkel, 30, has quietly emerged as a key arm in Phoenix. He was never a top prospect and didn’t truly establish himself as a reliable reliever until his age-28 season, in 2022. Over the past three seasons, he’s tossed 164 2/3 innings with a 2.95 ERA. It’s not necessarily flashy, as Ginkel is more good-than-great in terms of strikeout rate (26.5%), walk rate (7.3%), swinging-strike rate (12.5%), ground-ball rate (47.1%) and fastball velocity (96 mph average) in that time. Even with the lack of one standout area in which he truly excels, his above-average rates across the board have made him a consistent and reliable late-inning option for manager Torey Lovullo.

Also entering the mix is 34-year-old Kendall Graveman, who signed a one-year, $1.35MM deal after missing the 2024 season due to shoulder surgery. With 24 saves and 56 holds from 2020-23, Graveman is no stranger to late-inning work. After moving to the bullpen in Sept. 2020 with the Mariners, Graveman rattled off 197 1/3 innings with a 2.78 ERA, 24% strikeout rate, 10.3% walk rate and 49.2% grounder rate. At his best, Graveman averaged better than 96 mph on his heater and offered a Ginkel-esque blend of above-average strikeout, walk and ground-ball rates while sitting around 96 mph with his main offering. Whether he can return to that form in the wake of last year’s shoulder surgery is an open question.

However it shakes out, the Snakes look to have a solid quintet of arms rounding out the late-inning group at Chase Field. Lefty Joe Mantiply offers a solid middle-inning complement who has picked up around 12 holds per year over the past four seasons. A starter who doesn’t make the rotation (e.g. Jordan Montgomery, Ryne Nelson) could hold down another spot. Bryce Jarvis, Kyle Nelson and non-roster candidates like Shelby Miller, Scott McGough, John Curtiss and Josh Winder (among others) will vie for what’s likely one open spot.

There’s enough left on both the trade and free agent markets that it’s not impossible to envision a change still impacting Lovullo’s bullpen composition. Signing Robertson might be too pricey, likely pushing the D-backs into $200MM+ payroll territory for the first time, but if GM Mike Hazen ultimately finds a trade partner for Montgomery, any savings could make Robertson feel likelier. The Padres have been open to offers on Robert Suarez. Trading within the division probably isn’t either team’s first choice, though. A Ryan Helsley trade before next offseason feels virtually inevitable but also seems likelier to happen in-season at this point.

In any bullpen, there’s almost always room for one more addition. But, if this is the group the D-backs take into the season, they can still feel good about an impressive breadth of experienced late-inning arms who have the makings of a strong overall unit.

Diamondbacks Still Involved In Free Agent Relief Market

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The Diamondbacks have pursued late-inning help all offseason. Arizona’s lone major league bullpen pickup was their waiver claim of Seth Martinez from Houston. The Snakes let Paul Sewald walk in free agency, leaving them without much in the way of experienced closers.

General manager Mike Hazen told reporters this afternoon that any late-offseason bullpen pickup is likelier to come by way of free agency than trade (relayed by Alex Weiner of Arizona Sports). The bullpen market has moved rapidly over the past four or five weeks. David Robertson stands as the top unsigned reliever. He has ample experience as both a closer and setup man. Robertson will be limited to a one-year deal at age 40, though he could command an eight-figure guarantee after posting an even 3.00 earned run average while striking out a third of opponents across 72 innings for the Rangers.

There are a handful of other free agent relievers who still seem likely to land big league deals. Kyle Finnegan, Andrew Chafin, and Phil Maton should all get major league contracts. Buck Farmer, Lucas Sims, Héctor Neris and injury returnees Kendall Graveman and Keynan Middleton are all unsigned. Craig Kimbrel has the most closing experience of any free agent, though he’s coming off a dismal season with the Orioles.

If the Diamondbacks don’t add anyone from that group, the ninth inning could be up for grabs in camp. Manager Torey Lovullo said yesterday that he’d prefer having an established closer but is “not going to force it” if a committee approach works better (link via Nick Piecoro of the Arizona Republic). Lovullo listed A.J. Puk, Justin Martinez and Kevin Ginkel as in-house candidates to close.

Puk was utterly dominant after the D-Backs acquired him from the Marlins at last summer’s deadline. The southpaw fired 27 1/3 innings of 1.32 ERA ball while striking out nearly 42% of batters faced. Puk has had three straight seasons as an excellent late-game weapon. He didn’t close much last year but recorded 15 saves two seasons ago.

Martinez turned in a 2.48 ERA over 72 2/3 innings in his first full big league campaign. The righty punched out nearly 30% of batters faced with a massive 58.9% grounder percentage. His sinker landed north of 100 MPH on average, while opposing hitters had no success against his splitter. Martinez doesn’t have Puk’s multi-year track record but clearly has closing stuff. Ginkel turned in a 3.21 ERA with a strong 26.5% strikeout rate across 70 innings. While he seems likelier to stick in a setup capacity, the righty has been a reliable bullpen piece for the past three years.

MLBTR Podcast: Fallout From The Trade Deadline And Mike Trout Injured Again

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The latest episode of the MLB Trade Rumors Podcast is now live on Spotify, Apple Podcasts, and wherever you get your podcasts! Make sure you subscribe as well! You can also use the player at this link to listen, if you don’t use Spotify or Apple for podcasts.

This week, host Darragh McDonald is joined by Steve Adams of MLB Trade Rumors to discuss…

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