However, Cardinals manager Mike Matheny appealed, saying that Harper did not touch second base as he was returning to first. After the appeal, first-base umpire Jim Wolf called Harper out to end the inning.
At first, Nationals skipper Matt Williams was going to challenge it, but he decided not to.
"[Harper] didn't necessarily pass [second base], but as he stopped, he made a move toward third," Williams said. "If he stays on that base and stands there and returns [to first], it's not an issue. But the fact that he went toward third base and came back [without touching second], I guess that is intent of rounding the base."
Bill Ladson is a reporter for MLB.com and writes an MLBlog, All Nats All the Time. He can be found on Twitter @WashingNats. This story was not subject to the approval of Major League Baseball or its clubs.