PHILADELPHIA — St. Louis Cardinals right-hander Michael Wacha has left Wednesday's start against the Philadelphia Phillies with a left oblique strain.

Wacha exited the game in the bottom of the fourth. He allowed three runs — one earned — in 3 2/3 innings.

Wacha surrendered a two-run homer to Cesar Hernandez and pitched to one more batter before he was replaced by Mike Mayers.

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