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DENVER (AP) - The Washington Nationals have placed third baseman and outfielder Ryan Zimmerman on the 15-day disabled list with a strained right hamstring.

To take his place on the roster, the Nationals recalled infielder Zach Walters from Triple-A Syracuse. He was available for Wednesday's game against the Colorado Rockies.

Zimmerman was injured in the sixth inning Tuesday night while running out a grounder. Manager Matt Williams says Zimmerman had an MRI on Wednesday and remains "pretty sore."

The 29-year-old Zimmerman missed 44 games with a fractured right thumb earlier this season.

The Nationals are 33-19 this year when Zimmerman is in the lineup. He's hitting .282 with five homers and 36 RBIs.

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