"He looks good," Nats manager Davey Johnson said. "He's his old irritable self."
Johnson helped cover McCatty's duties during the series against the Tigers, before pitching coordinator Spin Williams joined the club for its three-game set against the Brewers.
Andrew Simon is a reporter for MLB.com. Follow him on Twitter @HitTheCutoff. This story was not subject to the approval of Major League Baseball or its clubs.