Shortstop Andruw Monasterio loses his helmet as he strikes out in the eighth inning of the Red Sox's 7-3 loss to the Athletics on Saturday in Boston. (Jim Davis/Associated Press)BOSTON — The Boston Red Sox failed in their bid for a second winning streak of 10 or more games in the same season, losing to the Athletics 7-3 on Saturday. The A’s hadn’t won since beating the Red Sox at home on July 28. Brian Serven’s RBI single cut the Athletics’ deficit in half before Heim’s two-run single in the fifth put them ahead. The Red Sox haven’t announced a starter.