The 23-year-old, who is currently at Double-A Harrisburg, hit .412, with one homer and four RBIs in six games with low Class A Hagerstown and Class A Advanced Potomac.
"Chris is doing better," Nationals manager Davey Johnson said. "He played nine innings the other day. He comes out of it and is still sore. I think he's not risking any injury right now, so he should come through pretty quickly."
In 31 games last season, Washington's 2006 first-round Draft pick batted .248, with 10 RBIs over 109 at-bats.