Brad Keller

The Red Sox and Brad Keller have evidently reunited on another minor league deal, as he started for Triple-A Worcester yesterday. He had elected free agency last week after being designated for assignment but seems to have signed a fresh pact. If the deal was formalized prior to September 1, he will be postseason eligible with the Sox.

Keller, 29, has been on and off the Boston roster for the past few months. He actually started the season with the White Sox on a minor league deal. He was added to that club’s roster in late April but lasted about three weeks before being designated for assignment, clearing waivers and electing free agency.

He then signed with the Sox and was on their 40-man roster for a few months but elected free agency in mid-August when they attempted to option him to the minors. As a veteran with more than five years of service time, he can’t be optioned without his consent. He went to the open market but quickly re-signed on a new minor league deal. He was added back to the roster last week but designated for assignment one day later, which led to another trip to free agency and this new minor league deal.

Around all of those transactions, Keller has managed to throw 41 1/3 innings over 16 appearances on the year, allowing 5.44 earned runs per nine. His 16.7% strikeout rate is below average but he has limited walks to a 7.8% clip while getting grounders on 50% of balls in play. He’s also logged 51 Triple-A innings on the year with a 4.06 ERA and similar peripherals.

Keller was once a strong rotation member with the Royals but his recent years have been fairly similar to his 2024 campaign. By the end of 2020, he had a 3.50 ERA in 360 1/3 innings but he has a 5.18 ERA in 360 frames from 2021 to the present.

The Red Sox recently lost James Paxton to the injured list for the rest of the year, putting him on the list of guys who won’t return to the club this season, next to Lucas Giolito, Garrett Whitlock and others. They currently have a rotation of Tanner Houck, Nick Pivetta, Brayan Bello, Kutter Crawford and Cooper Criswell. There are some workload concerns in there, as Houck, Crawford and Criswell have already set personal highs in terms of innings pitched in a season. Quinn Priester is another option on the 40-man roster but he has an 8.10 ERA in five Triple-A starts since being acquired from the Pirates.

If they need a spot start at some point this month or someone in that group needs to go on the injured list, Keller should be good to go since he pitched five innings yesterday. The Sox also have Josh Winckowski and Rich Hill on the roster but Hill hasn’t gone more than an inning and a third with the club so far. Winckowski has had plenty of multi-inning outings but hasn’t gotten into a game since August 23, so it might be hard for him to suddenly throw five or six innings on demand.

Righty Brad Keller elected free agency after being waived by the Red Sox, tweets Chris Cotillo of MassLive. Boston designated Keller for assignment on Tuesday when they called up Rich Hill.

It’s a repeat of the process that played out two weeks ago. Keller elected free agency on August 13 rather than accept an optional assignment to Triple-A, the right of any player with at least five years of service time. He very quickly re-signed with Boston on a minor league contract and was called back up on Monday. Keller logged four innings of relief that night, allowing five runs on seven hits and a pair of walks. Boston swapped him out for Hill the next day.

The 29-year-old Keller has split this season between the White Sox and Red Sox. He has absorbed 41 1/3 innings over 16 appearances, generally working in low-leverage relief. Opponents have tagged him for a 5.44 ERA behind nearly two home runs per nine innings. Keller’s 16.7% strikeout rate is well below average. He’s getting grounders at a strong 50% clip, but opponents have done a lot of damage when they’ve gotten the ball elevated.

Keller has never had a strong strikeout and walk profile. His calling card has been his ability to keep the ball on the ground. That translated into serviceable back-of-the-rotation numbers for the Royals, for whom he posted a 4.27 ERA over six seasons. Keller’s final season in K.C. was a disaster, as he walked a staggering 21.3% of batters faced. The Royals eventually announced that he’d been diagnosed with thoracic outlet syndrome.

The Sox could again try to bring Keller back on a non-roster deal. He’s had some success this year in Triple-A, combining for a 3.52 ERA over 46 innings between Chicago’s and Boston’s affiliates. Keller has started nine of 12 appearances in the minors and can serve as rotation or long relief depth wherever he lands.

The Red Sox have re-signed right-hander Brad Keller to a minor league deal, per Chris Hatfield of SoxProspects.com on X. The veteran elected free agency earlier today but has quickly returned to Boston on a non-roster pact.

Keller, 29, is a veteran with more than five years of service time. That gives him the right to reject optional assignments to the minor leagues. Earlier in the year, he did consent to be optioned by Boston, getting recalled a few days ago. The Sox optioned him a second time but he decided to exercise his right to explore the open market. It seems he didn’t find much to his liking and quickly reunited with the Sox on this minor league deal.

The righty had a nice run with the Royals earlier in his career but he has hit a few bumps in more recent seasons. In the 2018-2020 seasons, Keller logged 360 1/3 innings with Kansas City, allowing 3.50 earned runs per nine in that stretch. His 16.8% strikeout rate was below par but his 9.1% walk rate was around average and his 52.1% ground ball rate was quite strong.

But his ERA crept north of 5.00 in both 2021 and 2022. Last year, he was only able to make 11 appearances before requiring surgery to address thoracic outlet syndrome. This year, he has split his time between the White Sox and the Red Sox, tossing 37 1/3 innings with a 5.30 ERA, 17.8% strikeout rate, 7.7% walk rate and 49.6% ground ball rate.

The Sox bolstered their rotation prior to the deadline by acquiring James Paxton from the Dodgers but he recently suffered a torn calf after just three appearances with Boston. Cooper Criswell is currently on the injured list with COVID but the club is planning on slotting him into the rotation when he’s healthy. Whenever that happens, he’ll join Tanner Houck, Brayan Bello, Nick Pivetta and Kutter Crawford.

The club has Quinn Priester on the 40-man roster as depth but he has allowed 11 earned runs in 6 1/3 Triple-A innings since being acquired from the Pirates. Wikelman Gonzalez is also on the 40-man but he has a 5.93 ERA at Double-A this year and would have to skip Triple-A completely to help the big league club at this point. The club has Naoyuki Uwasawa and Jason Alexander on hand as non-roster depth but Keller has far more major league experience than those two and could be ahead of them in line to get the call whenever a fresh arm is needed next.

Red Sox right-hander Brad Keller has elected to become a free agent, reports Alex Speier of the Boston Globe. As a player with five-plus years of big league service, Keller must consent to being optioned to the minors. He agreed to be optioned once earlier this season, but when the Red Sox sought to option him earlier this week, he instead exercised his right to become a free agent and seek a new opportunity.

Keller, 29, was a fixture in the Royals’ rotation from 2018-23. One of the more successful Rule 5 picks in recent memory — Kansas City plucked him out of the D-backs’ organization in the 2017 Rule 5 Draft — he enjoyed three sharp seasons as a starter for the Royals before struggling repeatedly from 2021-23, often due to injuries. After logging a 3.50 ERA in 360 1/3 innings for K.C. from 2018-20, Keller was roughed up for a 5.14 mark in the three subsequent seasons. Things went way off the rails in 2023, when he walked 45 hitters in 45 1/3 innings before going on the injured list and eventually undergoing thoracic outlet surgery.

The White Sox signed Keller to a minor league deal over the winter, and he had a brief run with Chicago before being designated for assignment and electing free agency. The Red Sox scooped him up in late May. After a tough debut in Baltimore, he settled in to pitch well over a string of eight long-relief appearances, but Boston sent him to the minors in late June (a move he approved at the time). He was recalled on Friday, surrendered three runs in four innings against the Astros on Saturday, and was optioned back to Triple-A Worcester on Monday — this time exercising his right to become a free agent.

Overall, Keller has pitched 37 1/3 innings between the ChiSox and BoSox this season. He’s logged a discouraging 5.30 ERA in that time, but his season isn’t without its silver linings. First and foremost, the disastrous command issues he displayed last season have come back down to Earth. In fact, Keller has not only put last year’s ghastly 21.3% walk rate behind him — he’s sporting a career-low 7.7% walk rate in his 37 1/3 frames. His 17.8% strikeout rate is below the league average but is right in line with the 17.4% mark he posted prior to his TOS-ruined 2023 season. Keller has seen the velocity on his four-seamer and sinker tick up slightly (though he’s also primarily been working in relief, so that’s not necessarily due to better health), and this year’s 9.1% swinging-strike rate is the second-best mark of his career (but still worse than league-average).

Down in Triple-A, things have gone better. He’s pitched a nearly identical slate of 38 innings there and has similar walk and strikeout rates to the ones he’s posted in the majors. However, he’s sporting a 4.26 ERA that’s more than a full run lower than his MLB ERA, due largely to the fact that he’s been able to avoid the long ball in a way he hasn’t at the MLB level (0.24 HR/9 in Triple-A, 1.93 HR/9 in MLB). In all likelihood, his home run rate in the majors is due for some positive regression, while his home run rate in the minors is likely due to swing the other direction.

For a team needing some late-season rotation depth or length in the bullpen, the veteran Keller could be a worthy flier. The Twins, Astros, Guardians, Mets, Braves and Padres are among the postseason hopefuls who have incurred injuries or are experiencing notable workload concerns among their current crop of starting pitchers.