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7/23/2014 2:16 P.M. ET

Strained right hamstring forces Zimmerman to DL

Infielder Walters, Nationals' No. 10-ranked prospect, recalled from Triple-A Syracuse

The Nationals placed Ryan Zimmerman on the 15-day disabled list with a strained right hamstring Wednesday and recalled infielder Zach Walters from Triple-A Syracuse to take his spot. Zimmerman will be going through his second stint on the DL this season after missing 44 games due to a fractured right thumb.

Zimmerman, a former All-Star and National League Gold Glove Award winner, exited Tuesday night's game in the sixth inning after injuring himself while trying to beat out a double play. The Nationals are 33-19 with the 29-year-old in the starting lineup this season, and they're 22-24 when Zimmerman isn't able to play.

Walters, a 2010 ninth-round Draft pick who is ranked No. 10 among Nationals prospects, batted .182 with three home runs in a 27-game stint with the Nats earlier this season. The 24-year-old was hitting .300 with a .358 on-base percentage and 15 home runs in 60 games for Syracuse.

Zimmerman is batting .282 with five home runs and 36 RBIs this season, but he had really started to find a comfort zone in recent weeks. Zimmerman batted .362 (21-for-58) with a .418 on-base percentage and a .569 slugging mark in 16 July games after hitting .212/.284/.337 in 27 games in June.

Spencer Fordin is a reporter for MLB.com. This story was not subject to the approval of Major League Baseball or its clubs.