Felix Doubront left Tuesday's start for Triple-A Pawtucket with a right hamstring injury. Doubront suffered a mild hamstring strain in his final start before the All-Star break. He thought it was no big deal, but it appears he's now aggravated the ailment. The left-hander has pitched well this season when healthy, but he's missed time with elbow and groin maladies and now has the hamstring to deal with. It's not clear at this point how long he might be out.