The 2026 Seattle Mariners season is the 50th season in franchise history and their 27th full season (28th overall) at T-Mobile Park, their home ballpark in Seattle, Washington. The Mariners lost on Opening Day on March 26 against the Cleveland Guardians in Seattle. The regular season will end on September 27 against the Anaheim Angels at home. The team is looking to improve their performance from their previous season, where they reached the 2025 American League Championship Series. The Mariners...