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04/11/10 2:10 PM ET

Willingham, replay slam Mets

Overturned call clears bases for Nats in first inning

NEW YORK -- Nationals outfielder Josh Willingham's drive off Johan Santana in the first inning on Sunday, originally ruled a three-run triple, was changed to a grand slam after umpires reviewed the play. It marked the first use of instant replay at Citi Field this season.

With the bases loaded and one out in the first, Willingham hit a drive off the center-field wall that bounced back onto the field of play. Two runs scored easily, before Adam Dunn barreled into Mets catcher Rod Barajas, plating a third run and knocking the ball loose in the process. That prompted Willingham to also attempt to score, though Barajas managed to recover and tag him out -- for a time.

After a brief video review, umpires ruled that the ball hit just to the right of the orange line in center field, indicating a home run. The hit was just the third grand slam Santana had ever allowed.

Anthony DiComo is a reporter for MLB.com. This story was not subject to the approval of Major League Baseball or its clubs.