October 4, 2026
October 4, 2026
Seattle Mariners 2025 Season
The Seattle Mariners‘ 2025 season ended with a division banner raised for the first time in 24 years. Manager Dan Wilson’s club closed the year at 90-72, three games clear of the Houston Astros. A shaky start turned into the franchise’s first playoff series win since 2001. Catcher Cal Raleigh authored one of the most remarkable individual seasons in recent baseball history. His power carried Seattle deep into October. A deep, versatile roster carried it the rest of the way, all the way to Game 7 of the American League Championship Series. What this team built across 162 games will define how this era of Mariners baseball is remembered.
Expectations entering the year were cautiously optimistic rather than sky-high. The rotation looked deep on paper, and the lineup carried real thump behind Raleigh and Rodríguez, even before the front office added another impact bat. None of that optimism survived first contact with April.
A 4-8 start threatened to bury the season before it had a chance to breathe. San Francisco swept Seattle in the opening weeks. Injuries stripped the rotation bare. George Kirby, Matt Brash and Troy Taylor all opened the year on the injured list. Rather than unravel, the Mariners steadied themselves. They closed April by winning seven straight series, a stretch that reset the tone for the summer ahead.
Dan Wilson’s calm hand mattered more in those early weeks than any single roster move. He refused to overreact to the slow start. He leaned on his bullpen and trusted his young lineup to catch up to its talent, and the roster rewarded that patience once the calendar turned warm. Bryan Woo emerged as the rotation’s anchor, finishing the year with 15 wins, a 2.94 ERA and 198 strikeouts. Those numbers kept Seattle competitive even as the bullpen absorbed extra innings. Andrés Muñoz backed him up. He claimed AL Reliever of the Month honors in the season’s first weeks and locked down the late innings all year.
Midsummer brought a moment bigger than any single game. The franchise retired Ichiro Suzuki’s number 51 on August 9, following his Hall of Fame induction. It became just the fourth number retired in franchise history. It was a reminder of the standard this roster was still chasing, and a jolt of civic pride for a fan base that had waited decades for a team worthy of that history.
September did not just save the season. It defined it. A ten-game winning streak from September 6 through September 16 turned a crowded wild-card picture into a genuine division chase. Players leaned into every superstition they could find. They grew mustaches and stuck to rituals that had nothing to do with mechanics and everything to do with momentum. Seattle clinched a playoff berth on September 23, its first since 2022. The division came the very next night, sealed by a 9-2 win over Colorado. The Mariners’ 90-72 finish traced directly back to that late-season surge. A team that had scuffled in April refused to let October slip away. Winning the AL West for the first time since 2001 validated years of roster-building patience. It gave Seattle a home-field platform the franchise had not held in a generation.
No player in franchise history had ever done what Cal Raleigh did in 2025. The switch-hitting catcher clubbed 60 home runs, breaking the Mariners’ single-season record. He also set the all-time mark for a catcher and became the first switch-hitter to ever reach the milestone. Raleigh backed the power with a Home Run Derby title, AL Player of the Month recognition in June and a Silver Slugger Award. He closed the year on the All-MLB Team, the clearest sign of just how far above the league he stood. The Mariners had locked him in that March, signing him to a six-year, $105 million extension. The deal looked like a bargain before a single one of those sixty swings had even happened. Every homer carried weight beyond the box score. Raleigh’s bat had become the offensive identity of a franchise still chasing its first World Series appearance.
Raleigh did not carry the offense by himself. Julio Rodríguez reached the 30-30 club for the second time in his career, finishing with 32 home runs and 30 stolen bases. Randy Arozarena matched that blend of pop and speed with 27 homers and 31 steals of his own. Jorge Polanco’s February re-signing kept the infield anchored heading into the year. General manager Justin Hollander reshaped the roster again in July, bringing in Josh Naylor, Eugenio Suárez and reliever Caleb Ferguson before the trade deadline. Suárez arrived late and still finished with 49 home runs on the season. That was a staggering number for a player who had missed his first three months in Seattle. That addition made the lineup one of the most dangerous in the American League down the stretch. Five Mariners made the All-Star Game. That depth mattered once the games of the Mariners’ 2025 season started counting twice as much in October.
Seattle finally silenced a quarter-century of postseason frustration in the Division Series. The Mariners dispatched the Detroit Tigers in five games, a series that delivered the franchise’s first home playoff victory since 2001. It validated everything the roster had weathered since that rough April start. T-Mobile Park roared with a crowd that had waited a generation for meaningful October baseball. The pitching staff, led by Woo and backed by Muñoz, made sure the noise had a reason to keep building. That the series win came at all was its own kind of triumph. Woo’s season had ended just days earlier, when a pectoral injury struck in the middle of the playoff push. Seattle absorbed the loss of its ace and still found a way through. Beating Detroit did more than advance Seattle to the next round. It re-centered the story of the Mariners’ 2025 season around redemption rather than heartbreak. It put the pennant within reach for the first time in a generation.
The pennant slipped away in the cruelest possible fashion. Seattle built a 2-0 series lead over the Toronto Blue Jays, then watched it disappear. The Mariners clawed back to lead 3-2, only to see that edge vanish as well. Everything came down to a Game 7 in Toronto, decided on a single swing. George Springer turned on a pitch and sent it into the night. It was a go-ahead home run on October 20, and it ended Seattle’s season while sending the Blue Jays to the World Series instead. That loss will sting for years. It does not erase what the Mariners’ 2025 season proved. A team that started 4-8 in April found its identity. It won a division for the first time since 2001. It came one swing away from the franchise’s first pennant.
That stretch, from the ten-game streak in September through Springer’s home run in October, defined the season. It gave Seattle a foundation the franchise had not felt in a generation. Raleigh’s extension keeps the engine of this offense in Seattle for years to come, and Suárez proved in half a season what he could mean over a full one. Fans who filled T-Mobile Park for October baseball, for the first time since 2022, left with a simple, defiant belief. The pennant that slipped away in Toronto is still out there to be won.
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