Zimmerman led off the second inning of Thursday's series opener against the Cubs with a double. Two batters later, he headed for home on Wilson Ramos' ground-ball single to left, and was tagged out at the plate on a perfect relay.
Crew Chief Jerry Layne, working second base, issued a review of the play to make sure that Castillo wasn't in violation of Rule 7.13, which prevents catchers from denying the runner a clean lane to home plate. The call was confirmed after a brief review, denying the Nationals a chance to take a 1-0 lead.
Joe Popely is an associate reporter for MLB.com. This story was not subject to the approval of Major League Baseball or its clubs.