"It was a good three days of work [at Nationals Park]," Williams said.
Rendon has yet to play a Major League game this season because of a left knee sprain and left oblique strain.
Bill Ladson is a reporter for MLB.com and writes an MLBlog, All Nats All the Time. He also can be found on Twitter @WashingNats. This story was not subject to the approval of Major League Baseball or its clubs.