The Red Sox had two pitchers to be concerned about after Friday night’s loss to the Mariners, according to a Yahoo! Sports report. Daisuke Matsuzaka left in the fifth inning with elbow tightness after his velocity fell off from the start of the game. The injury doesn’t appear serious, but he will be checked out more on Saturday. “I think we think he’s going to be OK for his next start,” manager Terry Francona said. Bobby Jenks entered in the seventh to protect a lead and couldn’t do it. The struggling reliever gave up two runs and three hits, leaving Boston with its third loss in four games.