On April 17,2009 with Gary Sheffield batting in the bottom of the 7th inning at Citi Field against the Milwaukee Brewers. He tied up the game at 4 and 4. This was Gary's 500th career homerun. He became the first met in history to hit 500 homeruns.
The Mets would win on a walk off their first at the ballpark's history. The Mets won to a score of 5-4. To see more click Citi Walk-Off.