Will Middlebrooks homered down each of the lines, David Ortiz and Dustin Pedroia also went deep, and the Boston Red Sox pounded the Kansas City Royals 11-5 on Monday night to snap a five-game losing streak. Middlebrooks, called up last week when Kevin Youkilis went on the disabled list, hit a three-run shot in the first inning and a/>history with at least one extra-base hit in each of his first fourbr />major league games. He also hit a grand slam in Boston’s 17-inning loss to Baltimore the previous night. Felix Doubront (2-1) allowed all five Kansas City runs over 6 1-3 innings, giving the Red Sox bullpen a much-needed rest. Boston used up every available arm against the Orioles, forcing left-fielder Darnell McDonald to finish the 9-6 defeat. The Royals’ Jonathan Sanchez (1-2) was pounded for six runs inbr />three-plus innings, the 11th straight time the former Giants/>starter failed to last more than five innings.