The Boston Red Sox walked off the Detroit Tigers 1-0 in ten innings at Fenway Park on April 17, 2026, with the DiamondIQ model's estimate moving from a 54 percent pre-game home win probability all the way to 100 percent once the game ended. Nine scoreless innings set the stage for an extra-inning finish decided by the slimmest of margins, as both clubs managed just four hits apiece and Detroit's lone error added to the tension of a game that refused to break open through regulation.
The decisive sequence unfolded in the bottom of the tenth, where Will Vest absorbed the damage. Masataka Yoshida delivered the biggest hit of the night, a single that shifted Boston's win probability by 16.9 percent, and Ceddanne Rafaela's strikeout — a strikeout that still registered a 19.5 percent win-probability swing in Boston's favor under the DiamondIQ model, reflecting the leverage of the moment — punctuated the inning's importance. Detroit had its own critical failures in the frame, as the top of the tenth saw Wenceel Pérez strand the automatic runner with a strikeout against Garrett Whitlock, a swing of negative 18.0 percent, and Riley Greene's flyout registered a 16.4 percent positive shift for Boston as Whitlock escaped the threat. Dillon Dingler's strikeout against Aroldis Chapman in the top of the ninth, a negative 13.9 percent swing, had earlier extinguished a Detroit opportunity before the game reached extras.
On the pitching side, Ranger Suarez was Boston's backbone, leading all pitchers with a 46.2 percent win-probability contribution, while Detroit's Casey Mize was equally dominant in a losing effort, posting a 35.2 percent WPA mark that underscored how thoroughly both starters suppressed offenses through the bulk of the contest. Aroldis Chapman added 13.5 percent in relief. Among position players, Rafaela, Yoshida, and Greene each cleared 16 percent in WPA and posted identical RE24 figures of 0.4 and 0.5, confirming that the walk-off rally was a collective effort concentrated entirely in those final few pivotal at-bats.
Analysis generated by DiamondIQ's model.