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The Mariners Need To Shake Up Their Offense

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Mariners fans entered the season with something of a sour outlook on the 2025 season. That's understandable, given an offseason in which the front office was clearly handcuffed by payroll limitations and a paper-thin trade market for big league hitters. Armed with a only a reported $15-16MM to patch over multiple needs in the infield, there wasn't a lot out there for president of baseball operations Jerry Dipoto and general manager Justin Hollander to realistically pursue.

Seattle wound up rolling the dice on a handful of cost-effective infield options. Jorge Polanco returned on a one-year deal with a conditional player option. Donovan Solano snagged a $3.5MM guarantee. Rowdy Tellez signed a minor league deal and made the team after a big spring showing (.298/.320/.574 in 50 plate appearances).

Frustration was understandable. The Mariners had made a big splash at the prior deadline, reeling in Randy Arozarena from the Rays, but fans hoping for a similarly bold strike in the offseason after another narrow playoff miss were left wanting.

That frustration likely faded for many as the Mariners raced out to a blistering start. On May 7, they sat with a 22-14 record, leading the American League West by a three-game margin and sporting a +31 run differential. One might imagine that the Mariners were again being carried by their brilliant rotation, but that wasn't the case -- at least not entirely. George Kirby has still yet to throw a pitch in 2025 as he recovers from some shoulder inflammation. Logan Gilbert hit the injured list on April 25 and remains there. Bryan Woo has been brilliant. Luis Castillo has been good. Gilbert was his typically excellent self prior to his flexor injury. But the Mariners' starting pitching, as a whole, has been a middle-of-the-pack unit.

Instead, Seattle's hot start was largely attributable to a surprisingly potent offense. Through that previously mentioned May 7 date, M's hitters were slashing .247/.340/.415, resulting in a 122 wRC+ that ranked third in the majors. They were fourth in home runs, seventh in runs scored, 12th in batting average, second in on-base percentage and ninth in slugging percentage.

In the week-plus since that time, the Mariners have lost five of six games and posted a collective .206/.259/.326 batting line (70 wRC+). Typically, there's little sense panicking over a week of poor results, but there was already reason to be a bit skeptical of Seattle's sudden offensive prowess. Good as Cal Raleigh is, he's not going to continue at a 50-homer pace. Polanco isn't going to keep his OPS north of 1.000. J.P. Crawford isn't sustaining a .410 OBP, nor will Leo Rivas keep hitting .341. Those timely early-season hot streaks buoyed the Seattle offense but can't all be sustained.

The Mariners seemingly recognize that some new blood is needed; they claimed Leody Taveras off waivers from the division-rival Rangers and took on about $3.7MM in salary to do so. That was an understandable move with both Victor Robles and Luke Raley on the injured list for the foreseeable future, but it shouldn't be the only one the Mariners consider.

Let's run through a few easy ways to bolster a lineup that is facing even more pressure than usual now that Bryce Miller has joined rotation-mates Kirby and Gilbert on the injured list...

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Mariners Select Ben Williamson

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The Mariners announced that they have selected the contract of third baseman Ben Williamson.  In corresponding moves, outfielder Dominic Canzone was optioned to Triple-A Tacoma, and Ryan Bliss was moved to the 60-day injured list to create space on the 40-man roster.

Since multiple injuries up and down the roster have left the Mariners in need of infield reinforcements, the door was opened for Williamson to earn the first call-up of his three-year career as a professional.  Williamson only made his Triple-A debut this season and has hit a modest .281/.317/.333 in 60 plate appearances in Tacoma, but the M’s can’t afford to be too picky given their lack of depth at the big league level.

Williamson was a second-round pick for the Mariners in the 2023 draft, and he has a total career slash line of .281/.366/.389 over 645 PA, with four home runs and 22 steals (in 29 attempts).  MLB Pipeline ranks him 13th on their list of Seattle prospects and Baseball America has him 14th, with BA’s scouting report describing Williamson as “a pest at the plate” due to his high contact rates and on-base skills.  While Williamson makes a lot of contact, he has lacked in hard contact and in overall power, as evidenced by his uninspiring slugging percentages even at the minor league level.

This may not be the ideal profile for a Mariners team in sore need of consistent hitting, but Williamson does offer immediate defensive help at third base.  He is regarded as an excellent fielder who can also chip in at second or shortstop, but the hot corner seems like his natural spot since regular third baseman Jorge Polanco has been limited to DH duty.  Williamson is a right-handed hitter that could pair with the lefty-swinging Miles Mastrobuoni in a platoon situation until Polanco is healthy enough to return to the field.

Since the Mariners are reportedly scanning the trade market for other infielders, Williamson might just be in line for a cup of coffee in the majors if Seattle can land some more experienced help elsewhere.  Beyond Polanco’s ongoing knee and side discomfort, Luke Raley has now moved from first base to the outfield in the wake of Victor Robles’ shoulder fracture, and Bliss will miss the next 4-5 months after undergoing surgery to fix a torn left biceps.  It was just a matter of time before the Mariners moved Bliss from the 15-day IL to the 60-day IL in order to free up a 40-man roster spot.

Mariners Exploring Infield Market

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Injuries have quickly changed the complexion of the Mariners’ infield. Second baseman Ryan Bliss will miss four to five months after suffering a tear in his left biceps and undergoing surgery. First baseman Luke Raley has shifted to the outfield in the wake of a fracture in Victor Robles’ shoulder, which will sideline him for around 12 weeks. Jorge Polanco is currently relegated to DH work and won’t play the infield for another week or two, per Adam Jude of the Seattle Times. He underwent knee surgery back in October and is dealing with some discomfort in his side as well.

With those early changes to the infield composition, the Mariners are poking around the market for potential external additions, Jude further reports. A major trade this time of year is rare but not unheard of. The Brewers just picked up young right-hander Quinn Priester in a trade with the Red Sox earlier this week, helping to shore up an injury-ravaged rotation in Milwaukee. Last year’s trade of Luis Arraez from Miami to San Diego occurred in early May. Of course, the Mariners spent the bulk of the offseason pursuing trades to bolster their infield and ultimately wound up making a series of small free agent signings instead — clearly not finding a match to their liking.

It’s unlikely that there are any teams that have strongly rethought their status as postseason hopefuls just a few weeks into the season. As such, it’s unlikely that there are any players available on the trade market at present whose teams weren’t willing to discuss them over the winter. If the Mariners couldn’t find an offseason trade of note to bolster their infield, it’s hard to envision them suddenly doing so now.

That said, Jude notes that Seattle’s front office is “combing” other rosters and looking at veteran players who are on minor league deals elsewhere. Many veterans will have opt-out dates and upward mobility clauses in April. Article XX(b) free agents (i.e. six-plus years of MLB service, finished the preceding season on a major league roster/injured list) who signed minor league contracts have a uniform opt-out opportunity on May 1. MLBTR took a look at 36 such players late in camp, though the majority this year happened to be pitchers.

This type of acquisition wouldn’t necessarily be a sexy one, but the Mariners have gotten no production to date out of Rowdy Tellez or Donovan Solano, and they’re hitting .200/.303/.333 as a team as of this writing. The bar for improvement is fairly low. Tellez and Solano will surely get some runway to turn things around, but it’s sensible to looking at other, similar veteran options who could potentially be had on the cheap. Among the veteran infielders on minor league deals and hitting well in Triple-A with other clubs are Christian Arroyo (Phillies), Scott Kingery (Angels), Harold Castro (Royals), Nick Gordon (Royals) and Jake Lamb (Giants).

Help could always come from the farm system as well. Jude writes that the organization is prioritizing top prospect Cole Young’s development at the moment and doesn’t want to rush him to the big leagues but could consider an accelerated path for third baseman Ben Williamson. Young is hitting .178/.302/.267 in Triple-A at the moment anyhow, making it tough to consider him an upgrade. Williamson is a plus defender at third base who’s gotten some reps in the middle infield, too. He’s light on power but has plus contact skills and is out to a .286/.314/.347 start in Tacoma. He batted .283/.375/.394 in 541 plate appearances between High-A and Double-A last year. First baseman Tyler Locklear didn’t hit in his big league debut last year but is slashing .286/.359/.457 through his first nine games in Triple-A this season.

If Seattle’s offensive doldrums continue much longer and there’s no help to be found outside the organization, it stands to reason that Williamson and/or Locklear could get early looks to help right the ship.

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