Mariners vs. A's Prediction, Odds, Probable Pitchers, Prop Bets for Monday, May 25

With May drawing to a close, the Athletics still lead the AL West by 2.5 games over the Seattle Mariners. The two clubs open a three-game series on Monday night, and a Mariners sweep could push them into the league lead. Luis Castillo has had a poor season, posting a 6.41 ERA and a 1.554 WHIP, with 3+ earned runs in six of 10 starts. Oakland sits fifth in MLB in wRC+ over the past 30 days (106) with an OPS of .732, compared with Seattle’s 7th-place wRC+ (OPS .700). The home underdogs are listed at -105 against the Mariners, reflecting a competitive matchup with divergent trends.

The series continues Monday, and odds can shift as lineups and form evolve, offering an intriguing contrast between two AL West rivals.