Grady Sizemore's RBI single in the 12th gave the Red Sox a 4-2 walk-off win against the Reds in the first of two at Fenway Park. The game-winner capped a three-hit, two RBI night for Sizemore. Mike Napoli also drove in two, while reliever Craig Breslow snagged his first win.
Boston has won three of four. Cincinnati had won its previous two games.
The short two-game series will end tonight with Jake Peavey going for Boston. WBSM pre-game time is 6:25 p.m.