Mariners' Trent Thornton: Shifted to 60-day injured list
Rotowire
The Mariners transferred Thornton (Achilles) from the 15-day injured list to the 60-day injured list Tuesday.
The transaction frees up a spot on the 40-man roster for the addition of Sauryn Lao. Thornton is out for the season after tearing his left Achilles on July 31.
Thornton underwent season-ending surgery Monday to repair a torn left Achilles tendon and is expected to face a recovery timeline of 6-to-8 months, Daniel Kramer of MLB.com reports.
Thornton suffered the Achilles injury during a July 30 relief appearance and finished the 2025 season with a 4.68 ERA, 1.30 WHIP and 32:14 K:BB over 42.1 innings. Given the timeline laid out by Seattle, Thornton's availability for the start of spring training will likely be affected, and the injury could prompt the Mariners to non-tender him this winter as he heads into his final season of arbitration in 2026.
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Mariners' Trent Thornton: Diagnosed with torn Achilles
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The Mariners placed Thornton on the 15-day injured list Friday with a torn left Achilles.
Thornton left Thursday's game against the Rangers on a cart, and imaging confirmed Friday that the right-hander tore his Achilles tendon. The diagnosis will put an early end to his season, and he'll finish 2025 with a 4.68 ERA and 1.30 WHIP alongside a 32:14 K:BB through 42.1 innings. The 31-year-old will likely miss the vast majority of the 2026 season as well.
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Mariners' Trent Thornton: Achilles injury feared
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Thornton was on crutches following Thursday's game against the Rangers and believes he suffered a serious Achilles injury, Daniel Kramer of MLB.com reports.
Thornton was injured while trying to cover first base late in Thursday's game and appeared to suffer a serious leg injury. He'll be sent for an MRI on Friday, at which time a diagnosis should become official.
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Mariners' Trent Thornton: Carted off field with leg injury
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Thornton suffered a left leg injury Thursday against the Rangers and departed on a cart, Adam Jude of The Seattle Times reports.
Thornton entered the game in the eighth inning and successfully recorded five outs. He then suffered what appeared to be a serious leg injury while trying to cover first base. Thornton will almost certainly need a stint on the injured list, but just how long he'll be sidelined remains to be seen.
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Mariners' Trent Thornton: Settling in after rocky start
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Thornton threw a clean seventh inning in Saturday's 7-6 extra-innings win over the Astros. He struck out one.
Although he has just five holds this season, Thornton is beginning to settle in following a dreadful start to the year that saw him hold a 7.71 ERA as of June 10. The right-hander has worked multiple innings for the Mariners in five of his last 11 outings, during which sports a 1.06 ERA, 0.82 WHIP and 14:7 K:BB covering 17 frames.
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Mariners' Trent Thornton: Should be fine after early exit
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Thornton threw 2.1 scoreless innings of relief before exiting Saturday's eventual 10-7 loss to the Cubs due to heat exhaustion, per Daniel Kramer of MLB.com. He allowed one hit and two walks while fanning three.
Thornton had to be helped off the field in the eighth inning, but he's not expected to require additional medical treatment away from the team. After throwing a season-high 51 pitches Saturday, Thornton figures to get a few days off before he's available out of Seattle's bullpen again anyway since he covered multiple frames. The 31-year-old right-hander missed about a month of action due to appendicitis earlier this year, and he's mostly struggled with a 6.35 ERA, 1.50 WHIP and 17:10 K:BB over 22.2 innings.
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Mariners' Trent Thornton: Reinstated from IL
Rotowire
The Mariners reinstated Thornton (abdomen) from the 15-day injured list Saturday.
Thornton landed on the 15-day injured list May 9 due to appendicitis, and it took three weeks for him to recover enough to embark on a rehab assignment with Triple-A Tacoma. He'll claim the spot in the Mariners' bullpen that was vacated by Casey Lawrence, who was designated for assignment in a corresponding move. Thornton posted a 5.87 ERA, 1.30 WHIP, five holds and an 11:4 K:BB across 15.1 innings prior to his stint on the IL.
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Mariners' Trent Thornton: Starts rehab assignment
Rotowire
Thornton (abdomen) started a minor-league rehab assignment with Triple-A Tacoma on Friday, MLB.com reports.
Thornton, who is recovering from appendicitis, tossed 16 pitches and fanned two in a scoreless inning Friday. The 31-year-old veteran right-hander has been on the injured list since May 9, but he's now tracking toward a return to Seattle's bullpen sometime around the first or second week of June. Thornton has a 5.87 ERA, 1.30 WHIP and 11:4 K:BB over 15.1 innings this season, and he'll likely work as a middle reliever once he rejoins the Mariners.
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Mariners' Trent Thornton: Placed on 15-day injured list
Rotowire
The Mariners placed Thornton on the 15-day injured list Friday with appendicitis.
Thornton will be eligible for activation May 21, but an appendectomy could result in a longer than minimum stay on the IL for the reliever. Troy Taylor is taking Thornton's spot in the bullpen.
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Mariners' Trent Thornton: Avoids arbitration
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The Mariners and Thornton avoided arbitration by agreeing to a one-year, $2 million contract Thursday, Daniel Kramer of MLB.com reports.
Thornton has turned into a quality reliever for the Mariners, collecting a 3.20 ERA and 98:24 K:BB over 98.1 frames since being acquired from the Blue Jays in 2023. The right-hander is slated for a middle relief role again in 2025.
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Mariners' Trent Thornton: Impressive for fourth win
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Thornton (4-3) got the win against the Cardinals on Sunday, firing two scoreless innings during which he allowed a hit and recorded two strikeouts.
Thornton played a pivotal role in the Mariners' pitching plans Sunday, providing two nearly perfect innings following an earlier-than-expected call from the bullpen due to Luis Castillo's exit as a result of a hamstring strain. Thornton threw 28 pitches over his two frames and produced his 10th scoreless appearance in his last 11 outings, lowering his ERA under 4.00 (3.99) in the process. Thornton's versatility has been leveraged frequently this season, as he's logged a career-high 64 appearances that have helped him to a career-best nine holds and his most wins since he was primarily a starter for the Blue Jays in his rookie 2019 campaign.
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Mariners' Trent Thornton: Saddled with loss Tuesday
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Thornton (3-3) took the loss against the Athletics on Tuesday, allowing an earned run on two hits and a walk over one-third of an inning. He struck out one.
Thornton was tasked with preserving a 2-2 tie when he entered in the ninth, and after retiring the dangerous Brent Rooker looking, he never recorded another out. Seth Brown would subsequently walk it off for the Athletics with a single that plated JJ Bleday, snapping an eight-appearance scoreless streak for Thornton and saddling him with his first loss since July 22. The veteran right-hander has been a mostly effective option for Seattle, but his presence in a high-leverage spot Tuesday may have been due to the fact closer Andres Munoz is battling elbow soreness.
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Mariners' Trent Thornton: Picks up first save
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Thornton recorded the first save of his MLB career in a win over the Rays on Wednesday, firing a perfect ninth inning.
Ryne Stanek worked the eighth and Andres Munoz faltered with the save opportunity to open the ninth, failing to record an out and leaving Thornton to inherit a bases-loaded jam. The right-hander deftly managed the dangerous scenario, inducing a fielder's choice groundout from Richie Palacios that allowed Josh Lowe to score but then retiring Amed Rosario on a game-ending double play. The one run went on Munoz's tab, affording Thornton his sixth scoreless outing in his last eight trips to the mound -- including his third straight -- as well as his first career save.
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Mariners' Trent Thornton: Snags third win Wednesday
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Thornton (3-1) got the win over the White Sox on Wednesday, firing a scoreless ninth inning during which he recorded a strikeout.
It was a bit of welcome deja vu for Thornton on Wednesday, as he captured a victory against the White Sox via a crisp 11-pitch outing for the second straight night. The right-hander has lowered his ERA and WHIP down to 3.30 and 1.03, respectively, impressive figures that complement his trio of victories and eight holds across 30 appearances.
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Mariners' Trent Thornton: Gets second win Tuesday
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Thornton (2-1) got the win against the White Sox on Tuesday, firing 1.2 scoreless innings while recording two strikeouts.
Thornton was rewarded for his pristine work -- he cruised through his six-out outing on 11 pitches, 10 of which found the strike zone -- when Cal Raleigh drove home the tying and go-ahead runs in the home half of the seventh inning after the reliever had thrown his last pitch. Thornton has bounced back from a rare stumble against the Angels on May 31 (three runs allowed over two-thirds of an inning) to produce scoreless efforts in three of his subsequent four appearances, a span in which he's recorded a pair of holds in addition to Tuesday's win.
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Mariners' Trent Thornton: Takes loss Sunday
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Thornton (0-1) took the loss against the Diamondbacks on Sunday, allowing an earned run on a hit and a walk over one inning.
Thornton was entrusted with preserving a 2-2 tie when he entered in the eighth inning, but he set himself up for some trouble by issuing a leadoff walk to Kevin Newman and subsequently surrendered a double to Ketel Marte that plated him with the go-ahead run. The Mariners would prove unable to overcome the one-run deficit, saddling Thornton with the loss. The stumble snapped what had been a near month-long stretch of impressive pitching for Thornton, who hadn't allowed a run in 10 consecutive appearances and had lowered his ERA from 13.50 to 0.84 in the process.
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Mariners' Trent Thornton: Solid through five appearances
Rotowire
Thornton has pitched 4.2 innings across five Cactus League appearances, allowing four runs (two earned) on three hits and four walks while recording two strikeouts.
The right-hander's numbers are a bit deceiving, as all of his trouble has come in just two of those outings. Thornton has otherwise posted a trio of one-inning scoreless appearances after impressing last season following his arrival in a trade with the Blue Jays. The 30-year-old has 36 career starts at the big-league level, and Daniel Kramer of MLB.com reports that manager Scott Servais plans to deploy Thornton in a multi-inning role out of the bullpen when necessary.
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Mariners' Trent Thornton: Takes second loss Monday
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Thornton (0-2) took the extra-innings loss against the Angels on Monday, allowing three unearned runs on two hits over one-third of an inning. He struck out one.
Thornton entered in the 11th inning hoping to preserve a 5-5 tie and got matters off on the right foot with a strikeout of Logan O'Hoppe before allowing consecutive singles, the latter plating automatic runner Kyren Paris. That led to Thornton's exit, but he was subsequently charged with two more unearned runs that were helped along by fielding errors. Thornton has now allowed at least one unearned run in three straight appearances following a stretch of eight straight scoreless outings, yet he still carries a stellar 1.85 ERA across 24.1 innings over 20 appearances between the Blue Jays and Mariners this season.
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Mariners' Trent Thornton: Serving as opener Saturday
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Thornton will serve as the Mariners' opening pitcher Saturday against the Rays, Daniel Kramer of MLB.com reports.
Like many relievers, Thornton broke into the big leagues as a starter, but he's pitched exclusively in relief for the past three seasons, while his three "starts" in 2021 were similar opener appearances. Thornton has thrown two innings in both of his last two appearances, but he's unlikely to throw much more than that Saturday before turning the game over to Luke Weaver, who is expected to work in bulk relief.
