By KEN POWTAK Associated PressBOSTON (AP) — 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. Red Sox first baseman Willson Contreras returned after missing two games with an illness, went 0 for 4 and was booed for jogging lightly on a ground out. 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.