American League West American League Wild Card Record vs. opponents Record vs. American League Record vs. National League Season summary March/April The Mariners started poorly, going 4–8 to begin the season, including being swept by the
San Francisco Giants. Starting with an 8th inning grand slam by
Randy Arozarena on April 9, the team's performance improved enough to lead the
AL West at the end of the month. The team won their last seven series of the month.
Rowdy Tellez hit home runs in three consecutive games at
Rogers Centre, his former home ballpark, to help win a series against the
Toronto Blue Jays. The Mariners then defeated
Boston Red Sox ace
Garrett Crochet in another series win. Several players had career-best performances, with
Dylan Moore and
Jorge Polanco winning back-to-back
AL Player of the Week awards. Their offense, along with
Cal Raleigh's 10 home runs, carried the Mariners. Closer
Andrés Muñoz tied for the MLB lead with 11 saves and did not allow a run, winning the
AL Reliever of the Month Award. The team was beset by injuries: starting pitcher
George Kirby and relievers
Matt Brash and
Troy Taylor started the season on the injured list, and regulars
Víctor Robles,
Logan Gilbert,
Ryan Bliss, Moore,
Luke Raley, and
Gregory Santos ended April injured. Polanco also dealt with a knee injury that prevented him from switch hitting or playing defense. As part of the team's reinforcements,
Ben Williamson,
Logan Evans, and
Sauryn Lao all made their major league debuts.
May The Mariners won their ninth consecutive series with a five-run deficit to defeat the
Athletics 6–5 on May 8. However, the team then lost five of six games at home, including being swept by the
Toronto Blue Jays. In the final game of the homestand,
Aaron Judge of the
New York Yankees hit his league-leading 15th home run. Reversing that streak, the Mariners then won five of six on the road, including sweeping the
San Diego Padres to open the
Vedder Cup and winning two against the
Chicago White Sox.
Julio Rodríguez hit a decisive grand slam on May 19. However, the team ended the month in a slump, losing three out of four games in Houston to the
Astros and three out of five games at home. On May 30,
Andrés Muñoz blew his third save of the month as the team fell behind Houston in the AL West. On May 31,
Cole Young had a walk-off in his MLB debut, a
fielder's choice in a 5–4, 11-inning win over the
Minnesota Twins. Earlier in that game,
Cal Raleigh hit his 22nd home run, tied for the MLB lead with
Shohei Ohtani. Raleigh led the team, batting .304 with 12 home runs and 26 RBI in May.
J. P. Crawford moved up to the leadoff role, hitting a first-pitch home run on May 4. The team continued to look for an everyday
right fielder, promoting
Rhylan Thomas for his MLB debut on May 2, then claiming
Leody Taveras off
waivers from the
Texas Rangers. The team's first base platoon of
Rowdy Tellez and
Donovan Solano also struggled. On the mound,
George Kirby made his first start of the season on May 22, but
Bryce Miller briefly went on the injured list, returning on May 31. Brash returned from injury, pitching on May 3 for the first time since the 2023 season. Other bullpen reinforcements included
Jackson Kowar, who made his Mariners debut on May 28,
Casey Lawrence, who returned to the team after being claimed by Toronto, and
Jesse Hahn, who was called up on May 21 when Lawrence was designated for assignment for the fifth time that season.
Blas Castaño made his MLB debut, pitching the final three innings of a 9–0 loss to the
Washington Nationals on May 28. Despite the blown saves, Muñoz allowed his first earned run on May 30 and led the majors with 17 saves.
June A
Randy Arozarena walk-off single, following another
Andrés Muñoz blown save against the Twins on June 1 put the Mariners back in first in the AL West. However, a 1–8 stretch put the Mariners behind Houston. The Mariners were swept on the road in
Baltimore, won one game out of three against the
Los Angeles Angels in
Anaheim, then were swept by the
Arizona Diamondbacks, with
Josh Naylor hitting a
walk-off grand slam off
Carlos Vargas on June 9 and
Eugenio Suárez hitting a grand slam on June 11. The Mariners then swept the
Cleveland Guardians at home, with
Jorge Polanco hitting a walk-off single off closer
Emmanuel Clase on June 14. The next day, Crawford hit a home run on
Father's Day. The Boston Red Sox then won two of three in Seattle, with the lone win coming as
Cal Raleigh hit a grand slam and
Bryan Woo threw 7 shutout innings on June 17. The Mariners started their road trip strong, winning two games against the
Chicago Cubs. In the rubber match on June 22,
Donovan Solano and
Dominic Canzone both hit two home runs. Seattle won its first two games in Minnesota, clubbing four home runs on June 23, before losing the final two games of the series to the
Twins. Returning home, the Mariners won two 12-inning games against the
Texas Rangers and beat the
Kansas City Royals on June 30. In that game, Raleigh hit his 33rd home run, tied for third most by any player at the end of June. Arozarena also hit his 100th major league home run. was the AL Player of the Month in June Raleigh was named the
AL Player of the Month for June. He hit .300 and led the AL with 11 home runs and had a .690 slugging percentage and 3 stolen bases. He also committed to participate in the
Home Run Derby in July. He was also named the
AL Player of the Week on June 1 and June 22. Woo remained the team's most dependable starter, reaching 16 consecutive starts in which he pitched at least 6 innings on June 28.
George Kirby tossed a career-high 14 strikeouts in a win on June 8. The Mariners began making changes to their lineup. Infield prospects
Cole Young and
Ben Williamson, both called up during the season, started regularly at second base and third base, respectively. Right fielder
Dominic Canzone hit a 450-foot home run in his first game after being called up on June 10, replacing
Leody Taveras, who was
designated for assignment (DFA). The team DFA'd
Rowdy Tellez on June 20 as
Luke Raley returned from injury.
July On July 2,
Cal Raleigh was named the starting catcher in the
All-Star Game. On July 6,
Andrés Muñoz,
Julio Rodríguez, and
Bryan Woo were selected to the AL team, with
Randy Arozarena later replacing Rodríguez. Raleigh won the
Home Run Derby, the second Mariner to win the contest, following three-time winner
Ken Griffey Jr. In the All-Star Game, Raleigh was 1-for-2, Arozarena 0-for-3, Woo pitched a scoreless third inning, and
Muñoz got two outs in the 8th inning. Prior to the All-Star Break, the Mariners lost two of the final three games at home to the
Kansas City Royals, demoting
Emerson Hancock after a poor start. Seattle then swept the
Pittsburgh Pirates with three straight
shutouts. Arozarena clinched the sweep by homering off
Carmen Mlodzinski, pitching in relief of ace
Paul Skenes, for a 1–0 victory on July 7. It was the franchise's first three-game sweep in which they did not allow a run. The team followed it up with two more sweeps, first getting swept by the
New York Yankees at
Yankee Stadium, wasting Woo taking a
no-hitter into the 8th inning on July 10. The Yankees won in a walk off after Muñoz blew a save after
tipping pitches to New York. The Mariners rebounded, sweeping the
AL Central-leading
Detroit Tigers, including besting reigning
Cy Young Award winner
Tarik Skubal on July 11. The final score was 12–3, with Raleigh hitting two home runs, including a grand slam late in the game. Facing a third consecutive division leader, the Mariners lost two out of three games to the
Milwaukee Brewers, with a Raleigh home run and scoreless performance by
Logan Gilbert and the bullpen snapping Milwaukee's 11-game win streak with a 1–0 win on July 22. returned to the Mariners in July 2025 The Mariners then embarked on a poor intra-division road trip, splitting a four game series with the
Los Angeles Angels in Anaheim and losing two out of three games to the
Athletics in
West Sacramento. Arozarena stole his 20th stolen base on July 29, completing his fifth consecutive 20
–20 season. During this stretch, the team made two notable trades with the
Arizona Diamondbacks, acquiring
Josh Naylor on July 25 and
Eugenio Suárez on July 30. Arizona received pitchers
Brandyn Garcia and Ashton Izzi for Naylor and first baseman
Tyler Locklear and pitchers
Juan Burgos and Hunter Cranton for Suárez. Ahead of the trade deadline, the team also acquired left-handed reliever
Caleb Ferguson from the Pirates for pitcher Jeter Martinez on July 30. The Mariners did not trade away any of their top prospects.
President of baseball operations Jerry Dipoto said the team sought to add even more relief pitchers. The Mariners won Suárez's first game back in Seattle, a 6–0 win over the
Texas Rangers. In that game, Raleigh hit his league-leading 42nd home run. He hit the most home runs in a season by a switch-hitting catcher, surpassing
Todd Hundley in 1996.
August J. P. Crawford hit a walk-off two-run home run on August 1. After a loss to the
Texas Rangers, the Mariners won 8 in a row, sweeping the
Chicago White Sox and
Tampa Bay Rays at home.
Cal Raleigh hit a go-ahead three-run home run against the Rays on August 8, then hit his 45th home run on August 10. During the Rays sweep, the Mariners retired
Ichiro Suzuki's number 51. After one win in Baltimore that moved the Mariners into a tie with the
Houston Astros in the
AL West,
Matt Brash allowed a walk-off double to
Jackson Holliday on August 13, the Orioles' first walk-off win of the season. That loss started a prolonged swoon, as the Mariners went 6–15 through September 5. Seattle won its first game against the
New York Mets before losing in
Nolan McLean's MLB debt and in the
MLB Little League Classic in
Williamsport, Pennsylvania. The
Philadelphia Phillies then swept the Mariners, who allowed 29 runs in three games to end a poor road trip. The Mariners rebounded at home, winning consecutive series against the
Athletics and
San Diego Padres. All-Stars
Bryan Woo earned his 11th win and
Andrés Muñoz earned his 30th save on August 22. Raleigh hit a 448-foot home run on August 24, his longest home run of the season and his 49th of the season, surpassing
Salvador Perez for most by a catcher. The Mariners ended the month losing two out of three on the road to the
Cleveland Guardians. Muñoz blew his 7th save in a 5–4 walk-off loss on August 29.
Julio Rodríguez powered the Mariners in August, continuing his trend of strong second-half hitting. He reached his fourth consecutive 20 home run, 20 stolen base club on August 4. He hit .321 with 7 home runs and 22 RBI in August. Raleigh led the team with 8 home runs and set a new record for most home runs by a catcher but batted .179, with only 9 non-home run hits. The Mariners waived
Dylan Moore on August 24, following a prolonged slump, as
Víctor Robles returned from the injured list. Woo reached 12 wins to lead the team, but his streak of starts with at least six innings and no more than two walks ended on August 25. Left-handed reliever
Gabe Speier allowed only one run in 15 appearances.
Emerson Hancock, who was inconsistent as a starter, returned to the Mariners on August 27 as a reliever.
September As
rosters expanded on September 1, the Mariners promoted top prospect
Harry Ford as well as infielder
Leo Rivas and reliever
Luke Jackson, jettisoning infielder
Donovan Solano and reliever
Sauryn Lao. The moves did not pay off immediately, as the
Tampa Bay Rays swept the Mariners in Tampa. The Mariners lost their first game in Atlanta, lowering their record to 73–68, their lowest winning percentage since July 10. The Mariners then swept the
St. Louis Cardinals at home, with Rivas hitting a walk-off 11th inning home run to clinch the sweep on September 10. The team then swept the
Los Angeles Angels for the franchise's first 7–0 homestand. Three pitchers set or matched personal strikeout records against the Angels:
Bryce Miller struck out 11 batters on September 11,
Bryan Woo struck out 13 batters on September 13, and
George Kirby matched a career-high 14 strikeouts the next night. The Mariners began a road trip against the
Kansas City Royals, with
Cal Raleigh hitting his 55th home run, passing
Mickey Mantle for most by a
switch hitter in a season, on September 16. The next night, the Mariners lost after a poor
Matt Brash relief effort, ending their winning streak at 10 games. The team employed two
superstitions during the winning stretch, with players growing mustaches and fans embracing a spell by an "
Etsy witch". The Mariners traveled to Houston tied with the
Astros for the
AL West division lead. The Mariners won all three games, with starters Woo (who left after 5 innings with a pectoral injury), Kirby, and
Logan Gilbert allowing 1 run in 17 innings. Raleigh hit his franchise single season record 57th home run on September 20, then homered the next day to close out the series. Returning home, the Mariners clinched a playoff spot, their first since 2022, by beating the
Colorado Rockies on September 23. The next night, the Mariners defeated the Rockies 9–2 to clinch their first
AL West title since the
2001 season. Raleigh hit two home runs, becoming the fourth AL player ever to hit
60 home runs in a season. On September 25, the Mariners completed a sweep of the lowly Rockies, securing a bye to the
American League Division Series due to a loss by the
Cleveland Guardians. After securing their postseason position, the Mariners were swept by the
Los Angeles Dodgers to end the regular season.
Clayton Kershaw, in his final regular season start, held Seattle scoreless in innings on September 28 for his 223rd career win. Raleigh's 60 home runs set new single-season records for a catcher, a switch hitter, and the Mariners. and Raleigh,
Julio Rodríguez,
Randy Arozarena, and
Jorge Polanco each hit at least 25 home runs, the most for the team since
1997. After joining the Mariners in July,
Eugenio Suárez finished the season with 49 home runs, tying his personal best. Rodríguez stole two bases on September 27, joining the
30–30 club for the second time. Arozarena, after joining the 20–20 club in July, finished with 27 home runs and 31 steals, stealing a base in three consecutive games on the final homestand. Woo led Mariners starters with 15 wins, a 2.94 ERA and 198 strikeouts, though his regular season ended on September 19 with a pectoral injury.
Luis Castillo led the team with 32 starts and finished strong, with 1.07 ERA in his final four starts.
Andrés Muñoz saved 38 games, nearly matching the 40 saves in his first 5 MLB seasons.
Gabe Speier was second among AL relievers with 76 appearances and a 29.2-to-1
strikeout-to-walk ratio.
Game log ==2025 roster==