Bryce Harper knee injury after stepping on first base running out a ground ball.

Bryce Harper hyperextended his left knee when he slipped on a wet first base Saturday night, dealing a potentially devastating blow to the NL East-leading Washington Nationals.

Manager Dusty Baker said Harper would undergo an MRI on Sunday, and the Nationals would know more about the extent of his injury then.

"He was in obvious pain, and he was praying, and I was praying, too," Baker said.

While running out a ground ball to the right side of the infield in the first inning of a 3-1 win over the San Francisco Giants on Saturday, Harper avoided contact with first baseman Ryder Jones, and then his left foot slipped on the base. His leg buckled, he went airborne, and he fell to the ground as his helmet went flying. 


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