The right-hander, nursing a right hip strain, pitched 6 1/3 innings and allowed just two hits, no runs and no walks while striking out six. He induced 11 groundouts, including one double play.
Before he went down with the injury, Wang was moved to the bullpen because of the recent success of Ross Detwiler coupled with his own struggles. Wang is 2-3 this season with a 7.61 ERA.
Chad Tracy and Jayson Werth were also in action Monday night with Triple-A Syracuse, combining to go 1-for-6 in the Chiefs' 6-1 loss.
Werth was making his second rehab outing as he works his way back from a broken wrist, and went 0-for-3 while grounding into a double play. Tracy was 1-for-3 with a strikeout and a single.
Werth is expected to rejoin the Nationals the first week in August, and Tracy (groin) is on a similar timetable.