Middlebrooks, who isn't in the lineup Wednesday, was diagnosed with a hamstring strain, but isn't expected to miss much time, the Boston Herald's Scott Lauber reports. "We don't feel like this is a long-term thing," Farrell said. "But we'd be putting him in jeopardy if we were to start him tonight." He left Tuesday's game with tightness in his right hamstring, and should be considered day-to-day for now. Utilityman Brock Holt will get the start at third base Wednesday.