On August 29, 2010 — For the first time in major league history, a walk-off home run is subject to a video review. After pinch-hitter Matt Diaz hits a two-run homer off the Marlins’ Leo Nunez in the 9th to tie the score and cap a comeback from a 6 – 1 deficit, the Braves’ Brian McCann hits a ball to deep right that bounces back onto the field. The umpires initially rule it a double, and McCann is standing at second base when the umpires step out to look at the replay; when it shows that the ball hit above the fence, he can trot home, where he is mugged by celebrating teammates.

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