Boston Red Sox at Seattle Mariners: Final Score & Recap

The Boston Red Sox handed the Seattle Mariners a 6-2 defeat at T-Mobile Park on June 19, 2026, in a game that remained tight through the middle innings before Boston broke it open decisively. The DiamondIQ model had opened with Seattle as a 63% pre-game favorite at home, but that probability was entirely erased by the final out.

The decisive sequence came in the top of the seventh inning, where Boston inflicted the bulk of its damage against Luis Castillo. Marcelo Mayer's single shifted win probability by plus 8.9 percentage points, and Ceddanne Rafaela followed with a double that added another 7.7 points in Boston's favor. Willson Contreras extended the rally with a single of his own, contributing a further 6.6-point swing. The frame produced four Boston runs and effectively ended the competitive portion of the evening. Prior to that outburst, the Mariners had their best chance to seize control in the second inning, but Cole Young's groundout off Ranger Suarez proved to be a minus-6.7-point swing against Seattle, killing that opportunity.

Ranger Suarez was the game's most valuable individual performer by the DiamondIQ model's estimate, generating an enormous plus-38.4% WPA while limiting Seattle to two runs on just two hits. Among position players, Mayer led all batters with a plus-11.8% WPA and a RE24 of plus-1.5, while Caleb Durbin posted the highest RE24 among Boston hitters at plus-1.8 to go with a plus-8.2% WPA. On the Seattle side, Bryce Miller contributed a plus-6.0% WPA in a losing effort, providing the Mariners' brightest spot in an otherwise difficult evening.