Hammel left Wednesday's start due to tightness in his left hamstring, Mark Gonzalez of the Chicago Tribune reports. Hammel lasted just one inning into Wednesday's start before leaving the game due to hamstring tightness. He was effective in his time on the mound, retiring the Cardinals in just 12 pitches. There's no word yet on how severe Hammel's injury is at this point, but he'll have the All-Star break to rest his hamstring.