Mariners' Miles Mastrobuoni Set for Backup Role After Improved 2025 Season

Miles Mastrobuoni is expected to return as a backup infielder for the Seattle Mariners in 2026, following an improved 2025 season where he batted .250/.324/.296 with one home run in 76 games. Known for his occasional appearances as a position player pitcher, Mastrobuoni notably pitched a scoreless inning for the Mariners in June 2025, lowering his career ERA to 27.00. This contrasts with a challenging 2023 outing for the Cubs where he allowed four hits, including a home run, in an eighth-inning appearance, resulting in a 108.00 Cubs ERA.