Chicago Cubs' Jason Hammel exits early with tight hamstring

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• John Jackson, Special to ESPN.com

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CHICAGO -- Chicago Cubs starter Jason Hammel left Wednesday night’s game with the St. Louis Cardinals after the first inning with left hamstring tightness.

Hammel pitched a 1-2-3 first inning -- striking out the last batter he faced, Jhonny Peralta -- but didn’t come out for the second inning.

Left-hander Clayton Richard, who was going to be skipped in the rotation this weekend, replaced Hammel on the mound.