Coco Crisp smacked a walkoff RBI single in the bottom of the 10th inning Saturday afternoon at O.Co Coliseum to lift the Athletics past the Red Sox 2-1. It was Crisp's only hit in five trips the plate, but it was obviously a big one. The A's got seven shutout innings from starter Jesse Chavez and improved their MLB-best record to 47-28. Oakland's +136 run differential is also by far the highest in the major leagues.