The 2025 Seattle Mariners season, the 49th in franchise history, featured a triumphant return to prominence as they clinched the first American League (AL) West title and Division Series victory since 2001. Catcher Cal Raleigh delivered a historically dominant season, smashing a franchise-record 60 home runs—the most ever by a catcher and a switch hitter in MLB history—while also winning the Home Run Derby. Raleigh was one of five Mariners selected for the All-Star Game, and the team honored legend Ichiro Suzuki by retiring his number 51 on August 9. After clinching a postseason berth on September 23 and the division title the next day, the Mariners defeated the Detroit Tigers in the ALDS, reaching the AL Championship Series for the first time in 24 years. Their pennant hopes ultimately were dashed, as they blew 2–0 and 3–2 series leads against the Toronto Blue Jays and lost Game 7 following a go-ahead home run by George Springer. Despite the deep playoff run, the team’s average home attendance at T-Mobile Park fell for a second consecutive year, drawing just over 31,000 fans per game.