SEATTLE MARINERS

The Mariners went 85-77 in 2024 and missed the playoffs, then rebounded to win the AL West at 90-72 in 2025 before making their deepest playoff run in franchise history, losing the AL Championship Series to Toronto. The 2025 playoff run and status as AL West favorites heading into 2026 has elevated collector interest in core pieces like Julio Rodríguez, while the trade deadline deal that sent ace Luis Castillo to Chicago and offseason acquisitions of Josh Naylor and utility man Brendan Donovan have shifted the card landscape. Top prospect Colt Emerson made the Opening Day roster, driving rookie card demand.

Where they stand: The Mariners sit at 31-29 (.517) through 60 games of the 2026 season, fighting to defend their division title. At the August trade deadline, Seattle acquired outfielder Taylor Ward from Baltimore and reliever Seranthony Domínguez to bolster their lineup and bullpen for the playoff push. Bryan Woo has been dominant at home with a 6-0 record and four earned runs over his last seven starts, while Julio Rodríguez and rookie Colt Emerson have provided power as Seattle battles for postseason positioning in early August.