Toronto Blue Jays vs Seattle Mariners Betting Trends

Toronto Blue Jays vs Seattle Mariners face off on October 15, 2025 at T-Mobile Park in Seattle, WA. This MLB matchup airs on Fox Sports 1 and offers crucial betting trends for sharp bettors.

Our game insights dive into RHP George Kirby (2.70 ERA, 1.00 WHIP). Kirby has held right-handed hitters to a .230 average with a 9.2 K/9 and a 2.70 SIERA, while lefties sit at .250 with an 8.5 K/9 and a 3.05 SIERA. On the other side, RHP Shane Bieber (6.75 ERA, 2.25 WHIP) has allowed a .270 average to righties with 8.7 K/9 and a 4.50 SIERA but performs better vs lefties (.220 average, 9.0 K/9, 3.80 SIERA).

The Blue Jays average 4.93 runs per game with a .265 batting average, and the Mariners post 4.73 runs and a .244 BA. Toronto has key infielders Bo Bichette (foot) and Ty France (hamstring) sidelined and Anthony Santander day-to-day, tilting the edge toward Seattle’s defense. In their 10-3 win on October 13, the Mariners smothered Toronto 10-3.

Seattle is a 1.5-run favorite at -162 with a total of 7 runs (UNDER -120). Moneyline odds sit at -135 for Seattle and +115 for Toronto at Caesars. The Mariners’ home ATS record can be viewed on our MLB standings page. Considering strong pitching splits, lineup questions, and low-scoring history, the UNDER 7 runs stands out. Ready to bet smarter? Start your OddsTrader Turbo subscription now or place your wager with a U.S. regulated sportsbook and profit off the edge.