Pujols left the game in the fourth inning and will undergo an MRI Thursday. After the game, he said he was sore and isn't sure how the injury happened.
"While I was running from second to third that's when I felt it the most," Pujols said, according to MLB.com. "I ran fine on that double and then all of a sudden I can't tell you, just one of those things. It was more when I was running from second to third, I kind of pulled up a little bit."
Pujols was 2-2 with a double and run scored before leaving the game. It's still unknown if the injury will cause him to miss any time, but he did miss 13 games in 2008 with a calf injury.
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