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Seattle recalled Wilcox from Triple-A Tacoma on Friday.
Wilcox, after initially falling short of the Opening Day roster, will join the big-league club after reliever Carlos Vargas (lat) was placed on the 15-day injured list. Wilcox has appeared in just one MLB game during his career.
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Mariners' Carlos Vargas: Headed to IL
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The Mariners placed Vargas on the 15-day injured list Friday, retroactive to March 24, due to a right lat strain.
Vargas threw 77 innings of relief for the Mariners in 2025 and figured to play an important role out of the bullpen once again in 2026. However, his season debut will be pushed back at least two weeks as he tends to a strained lat. Cole Wilcox was called up from Triple-A Tacoma in a corresponding move.
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Mariners' Luke Raley: Smacks Opening Day homer
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Raley went 1-for-4 with a solo home run in Thursday's 6-4 loss to the Guardians.
Raley, who got the Opening Day start in right field, led off the bottom of the fifth inning with a solo shot off Tanner Bibee, tying the game at 3-3. It's a nice start to the season for Raley, who struggled to a .202/.319/.311 slash line with just four homers in 73 games last year. The 31-year-old figures to get the majority of starts against right-handed pitching while splitting time with Victor Robles and Rob Refsnyder in right field.
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Mariners' Brendan Donovan: Homer, double in Mariners debut
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Donovan went 2-for-4 with a solo home run and a double in Thursday's 6-4 loss to the Guardians.
Donovan got the Mariners offense going in his first regular-season at-bat with the team, as he led off the bottom of the first inning with a home run off Tanner Bibee, tying the game at 1-1. Donovan picked up where he left off in spring training, when he slashed .413/.491/.543 across 57 plate appearances. The 29-year-old is expected to open the year as Seattle's primary third baseman and leadoff batter.
Mariners' Dominic Canzone: Blasts two long balls in opener
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Canzone went 2-for-4 with a pair of solo home runs Thursday in an Opening Day loss to the Guardians.
All four of Seattle's runs in the game came on solo homers, and Canzone was responsible for two of those. He took Tanner Bibee (shoulder) deep in the second inning and added a 444-foot shot off Shawn Armstrong in the seventh. Canzone belted 11 home runs across 268 regular-season plate appearances last season, so he has the potential to be a decent source of power. He started at DH on Thursday and should also log time in the outfield, potentially giving him enough playing time to be worth a look in most fantasy leagues.
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Mariners' Logan Gilbert: Fans seven in no-decision
Rotowire
Gilbert allowed three runs on five hits and no walks while striking out seven batters over 5.1 innings in a no-decision against Cleveland on Thursday.
Gilbert gave up a solo homer to the second batter he faced in the game (Chase DeLauter), but he was able to get through four frames with only that tally on his line. However, he served up two more runs in the fifth inning and was pulled after retiring the only batter he faced in the sixth. Gilbert didn't get the win, but he did show good strikeout stuff with 12 whiffs and seven punchouts. The right-hander posted a career-best 11.9 K/9 last season and could be among the AL's strikeout leaders if he's able to stay healthy throughout the current campaign.
Mariners' Luis Castillo: Opening season as fifth starter
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Castillo is slated to make his first start during the Mariners' fifth game of the season Monday versus the Yankees at T-Mobile Park, Adam Jude of The Seattle Times reports.
Emerson Hancock is the Mariners' de facto fifth starter while stepping into the rotation in place of the injured Bryce Miller (oblique), but he'll end up taking the hill for Seattle's fourth game Sunday versus Cleveland while Castillo moves to the back of the schedule. The rotation setup is likely just a means to get Castillo some extra rest after he started the Mariners' spring training finale Monday in San Diego. Castillo covered five innings and tossed 76 pitches in that outing, so he should be ready to handle a relatively normal workload in his 2026 debut.
The Mariners designated Knizner for assignment Tuesday.
Knizner will cede his spot on 40-man roster to Mitch Garver, who beat him out for the No. 2 catcher job coming out of spring training. A lifetime .211/.281/.316 hitter over parts of seven MLB seasons, Knizner could attract interest on the waiver wire from other teams looking to upgrade their backup catcher spot ahead of Opening Day.
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Mariners' Leo Rivas: Will be Opening Day shortstop
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Rivas is slated to start at shortstop for the Mariners on Opening Day after J.P. Crawford (shoulder) was placed on the 10-day injured list, Adam Jude of the Seattle Times reports.
The Mariners might have considered top prospect Colt Emerson to play shortstop if Crawford's absence was going to be an extended one, but he's expected back in a couple weeks. As such, the club will turn to the defensively gifted Rivas at shortstop. Rivas has a good eye at the plate, but he's unlikely to be worthy of a roster spot in fantasy leagues even while playing regularly.
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Mariners' Miles Mastrobuoni: Sidelined with calf strain
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The Mariners placed Mastrobuoni (calf) on the 10-day injured list Wednesday.
Mastrobuoni strained his right calf while playing for Team Italy in the World Baseball Classic two weeks ago. He'll be eligible to return April 1, but the utility player figures to require a bit more down time than that.
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Mariners' J.P. Crawford: Goes on IL with shoulder injury
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The Mariners placed Crawford (shoulder) on the 10-day injured list Wednesday.
Crawford has battled nagging right shoulder inflammation since the start of spring training and was given a cortisone injection last week. He is eligible for activation April 1 and has expressed optimism that he could return within the next couple weeks, per Adam Jude of the Seattle Times. Leo Rivas will fill in at shortstop for the Mariners while Crawford is shelved.
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Mariners' Bryce Miller: Shelved by oblique strain
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The Mariners placed Miller on the 15-day injured list Wednesday due to a left oblique strain.
Miller strained his left oblique in late February and was limited to just one appearance during Cactus League play. He's thrown a pair of bullpen sessions recently and hasn't encountered any known setbacks, but the righty will require several weeks to be build back up, per Adam Jude of The Seattle Times. Emerson Hancock will occupy a spot in the Mariners rotation until Miller is ready to make his 2026 debut.
The Mariners selected Garver's contract from Triple-A Tacoma on Wednesday.
Garver re-signed with Seattle as a non-roster invitee after camp opened and beat out Jhonny Pereda and Andrew Knizner for the backup catcher job. The 35-year-old will see some starts at catcher on days Cal Raleigh serves as the designated hitter, but Garver's playing time should be fairly limited.
