Seattle Mariners vs Boston Red Sox Preview
Today's Starting Matchup
Today's starting pitching matchup features Seattle Mariners's Bryce Miller (4-8, 4.12 ERA) against Boston Red Sox's Patrick Sandoval (1-3, 4.20 ERA).
Both starters carry similar ERAs, setting the stage for a potential pitchers' duel. WHIP: Bryce Miller 1.09, Patrick Sandoval 1.71.
Advanced metrics: Bryce Miller — FIP 4.32, K% 24.5%, 94.0 IP / Patrick Sandoval — FIP 4.23, K% 23.2%, 45.0 IP
Career H2H Analysis
Bryce Miller has struggled against Boston Red Sox's No. 4 hitter Wilyer Abreu, allowing a .400 career average (2-for-5).
Bryce Miller carries a .261 career BAA (6-for-23) vs. Boston Red Sox's top of the order — a neutral track record.
Patrick Sandoval has struggled against Seattle Mariners's No. 3 hitter Julio Rodríguez, allowing a .364 career average (4-for-11), including 2 HR.
Power threat alert: Julio Rodríguez (11타석 중 2홈런). Patrick Sandoval must be careful with these hitters' extra-base pop.
Patrick Sandoval carries a .265 career BAA (9-for-34) vs. Seattle Mariners's top of the order — a neutral track record.
Team Season Comparison
2026 season record: Seattle Mariners 65-74 (.468), Boston Red Sox 75-64 (.540).
Boston Red Sox holds the edge in the season standings, though Seattle Mariners can't be counted out based on head-to-head matchups.
Run differential: Seattle Mariners -70, Boston Red Sox +82. Boston Red Sox boasts superior run production.
Recent form: Seattle Mariners on a 1-game win streak, Boston Red Sox on a 1-game losing streak.
Based on starting pitching, Seattle Mariners holds the edge.
Bullpen Analysis
Seattle Mariners bullpen: 14 relievers on the active roster. Key arms: Andrés Muñoz (Closer) 4.29 ERA, 81K in 50.1IP, Bryan Woo 4.25 ERA, 149K in 148.1IP, Bryce Miller 4.12 ERA, 92K in 94.0IP.
Boston Red Sox bullpen: 14 relievers on the active roster. Key arms: Alec Gamboa 1.04 ERA, 18K in 26.0IP, Aroldis Chapman (Closer) 1.77 ERA, 60K in 45.2IP, Brayan Bello 4.85 ERA, 70K in 94.2IP.
Win Probability
Projected win probability: Seattle Mariners 49% vs Boston Red Sox 51%
Factors: Seattle Mariners's starter owns the lower ERA, Boston Red Sox's home-field advantage. Of course, baseball's inherent randomness means actual results may differ.
Key Tactical Points
Workload comparison: Bryce Miller averages 5.9 IP per start vs. Patrick Sandoval at 5.0 IP. Getting six-plus innings from the starter significantly eases the bullpen burden.
Bryce Miller has allowed 17 HR this season — a concern against a lineup with extra-base power.