The Seattle Mariners erased a three-run deficit and won in extra innings, defeating the Chicago Cubs 6-5 on a walk-off single by Leo Rivas in the 10th inning at T-Mobile Park. The Mariners scored four runs in the second inning to take their first lead, then held on through a seesaw finish that required a full 10 frames to decide.

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Alex Bregman carried the Cubs' offense, going 3-for-5 with two home runs and three RBIs. Bregman's two-run homer in the first inning, following Pete Crow-Armstrong's solo shot, gave Chicago an early 3-0 advantage. But the Mariners answered immediately in the second. Cal Raleigh's three-run homer tied the game at 3-3, and Brendan Donovan's single off Seiya Suzuki put Seattle ahead 4-3. Randy Arozarena added an insurance run in the fifth with a single that scored Brock Rodden, extending the lead to 5-3.

The Cubs refused to fade. Ian Happ's solo homer in the eighth cut the deficit to one, and Bregman's second home run in the ninth tied the game at 5-5, forcing extra innings. In the 10th, with the score still tied, Rivas delivered the decisive blow with a line-drive single to center, scoring Randy Arozarena and sending the Mariners home winners.

Matt Boyd allowed five runs over six innings for Chicago, while Emerson Hancock gave up three runs in 5.2 innings for Seattle. The Mariners' bullpen—Gabe Speier, Eduard Bazardo, Andres Munoz, and Seranthony Dominguez—combined for 4.1 innings of relief. Seranthony Dominguez earned the win with a scoreless 10th. Seattle improved to 61-68 with the victory. Chicago fell to 74-55 and extended its losing streak to two games.