Seattle Mariners vs Oakland Athletics Preview
Today's Starting Matchup
Today's starting pitching matchup features Seattle Mariners's Luis Castillo (1-5, 6.41 ERA) against Oakland Athletics's Aaron Civale (5-1, 3.31 ERA).
Oakland Athletics's Aaron Civale posts an solid 3.31 ERA this season, while Luis Castillo has been struggling at 6.41. There is a clear gap in starting pitching quality.
Advanced metrics: Luis Castillo — FIP 4.52, K% 22.1%, 46.3 IP / Aaron Civale — FIP 4.92, K% 16.5%, 51.7 IP
Team Season Comparison
2026 season record: Seattle Mariners 25-29 (.463), Oakland Athletics 27-26 (.509).
Recent form: Seattle Mariners on a 2-game losing streak, Oakland Athletics on a 1-game win streak.
Based on starting pitching, Oakland Athletics holds the edge.
Bullpen Analysis
Seattle Mariners bullpen: 13 relievers on the active roster. Key arms: Alex Hoppe 6.35 ERA, 12K in 11.1IP, Andrés Muñoz (Closer) 4.58 ERA, 32K in 19.2IP, Bryan Woo 3.82 ERA, 59K in 63.2IP.
Oakland Athletics bullpen: 13 relievers on the active roster. Key arms: Aaron Civale 3.31 ERA, 37K in 51.2IP, Hogan Harris (Setup) 2.96 ERA, 27K in 24.1IP, J.T. Ginn 3.19 ERA, 48K in 53.2IP.