Cleveland Guardians at Boston Red Sox: Final Score & Recap

The Boston Red Sox defeated the Cleveland Guardians 1-0 on September 23, 2026, at Fenway Park, with the DiamondIQ model's estimate of a Boston victory climbing from a pre-game 56% to a final 100%. The lone run of the game came in the bottom of the sixth inning, when Andruw Monasterio singled off Foster Griffin to push Boston ahead, a play that added 13.2% to the Red Sox's win probability. That margin proved to be all Boston needed in a game that produced just one crossing of the plate despite Cleveland generating five hits against a stingy Red Sox staff.

Cleveland's best opportunity to erase the deficit came in the top of the eighth, when José Ramírez worked a walk and Brayan Rocchio followed with a single off Garrett Whitlock, each play adding 7.9% to the Guardians' win probability and bringing the tying run to the plate. The rally died immediately, however, when Chase DeLauter grounded into a double play, a single swing that collapsed Cleveland's chances by 19.5% and effectively sealed the outcome. The Guardians finished with a costly error and left the lineup unable to capitalize on any of its five baserunners in a meaningful way.

On the mound, Sonny Gray was the backbone of the effort, leading all pitchers with a WPA of plus-26.4%, while Foster Griffin contributed plus-16.4% in relief and Aroldis Chapman closed things out with a plus-15.2% contribution. Offensively, Monasterio led Boston with a WPA of plus-5.5%, supported by Mickey Gasper at plus-4.3% and Nick Sogard at plus-3.1%. Boston's 12-hit advantage over Cleveland's five underscored a dominant team performance in a tight, low-scoring contest where the DiamondIQ model saw little doubt about the outcome once the sixth inning concluded.