Houston Astros at Seattle Mariners: Final Score & Recap

The Seattle Mariners defeated the Houston Astros 6-2 at T-Mobile Park on September 26, 2023, handing Houston a lopsided loss despite the Astros generating ten hits on the afternoon. The DiamondIQ model opened with Seattle as a modest favorite at 54% pre-game win probability, but that figure climbed steadily and closed at 100% as the Mariners built an insurmountable lead through five innings. Houston's three errors compounded their offensive inefficiency, leaving runners stranded throughout while Seattle converted its chances.

The decisive stretch came in the third and fifth innings, where Seattle did the bulk of its damage. In the bottom of the third, Josh Rojas reached via lineout in a sequence that shifted win probability by +8.9 percentage points against Cristian Javier, finishing the game as Seattle's second-most valuable batter at +10.4% WPA and +0.9 RE24. The fifth inning proved even more damaging, as Seattle plated three runs highlighted by a Cal Raleigh single off Rafael Montero that swung win probability by +13.1 percentage points, the single largest play of the game. Raleigh led all position players with +12.5% WPA and +1.9 RE24. Houston's best moment came in the top of the seventh when Jeremy Peña singled off Justin Topa for a +6.2% WPA play, though Jon Singleton's subsequent sacrifice fly off Matt Brash erased momentum at -4.5%.

George Kirby was the dominant force on the mound, generating +21.6% WPA to lead all players in the game, with Martín Maldonado's fifth-inning strikeout against him representing a -6.3% swing that illustrated how thoroughly Kirby neutralized Houston's lineup. Matt Brash added +10.3% WPA in relief. The DiamondIQ model favors pitching performances of Kirby's caliber as the primary driver of outcomes in games of this profile, and Seattle's clean defensive execution, zero errors against Houston's three, underscored the margin of control the Mariners maintained from the third inning onward.