San Diego Padres at Seattle Mariners: Final Score & Recap

The San Diego Padres defeated the Seattle Mariners 8-3 at T-Mobile Park on May 17, 2026, a result that shifted the DiamondIQ model's estimate of a Seattle win from 39 percent before first pitch down to zero percent by the final out. The Padres scored single runs in the first and fifth innings to build a modest cushion, then broke the game open with a five-run sixth that effectively ended any realistic path to a Mariners comeback. The decisive blow came from Gavin Sheets, whose home run off George Kirby in the top of the sixth swung win probability by 13.9 percentage points in San Diego's favor. Earlier in the fifth, Ty France's single off Kirby had added 10.6 percentage points. Seattle managed only one hit on the evening and scored all three of its runs in the bottom of the sixth, where Josh Naylor drew a walk to push back 5.2 points before Randy Arozarena's sacrifice fly off Yuki Matsui trimmed the deficit slightly, a play that cost San Diego 7.1 percentage points. On the negative side for the Padres, Manny Machado grounded into a double play in the fourth, erasing 5.4 percentage points of win probability.

Sheets finished as the game's most impactful offensive player, accumulating a cumulative WPA of plus-18.1 percent and a RE24 of plus-3.7, while France added plus-11.9 percent WPA and plus-2.8 RE24. On the mound, Lucas Giolito was the model's top-rated pitcher, contributing plus-16.7 percent WPA across his outing. Yuki Matsui followed with plus-3.0 percent WPA in relief, and Domingo Gonzalez added a negligible plus-0.1 percent. The Padres finished with 10 hits against Seattle's one, a disparity that reflected how completely San Diego controlled the contest despite committing two errors of their own.