An MRI on the hamstring of Cubs starter Jason Hammel has come back clean, per the Chicago Sun-Times, which is further reporting that he could return at the back end of the rotation immediately following the All-Star break.
Hammel, who sustained the injury Wednesday against St. Louis, left that game after just one inning. He is 5-4 with a 2.86 ERA, but has just two quality starts in his last six outings.