The Nationals will likely call up infielder Zach Walters to replace Ryan Zimmerman's roster spot on Sunday, a source told MLB.com following Saturday's 6-3 loss to Atlanta.
Walters, 24, batted .379 in 13 spring at-bats before his demotion. He is hitting .310 with three doubles, one triple and three RBI in 29 at-bats at Triple-A Syracuse.