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One of the major arguments against expanding instant replay is the time it would take up. It would lengthen an already slow-paced game.
But as home run instant replay has shown us, the system works. This play is just one example.
On April 11th of this year, the Mets and Nationals met at Citi Field in New York, with Johan Santana on the mound against Livan Hernandez. In the top of the first inning, Santana loaded the bases and Josh Willingham crushed a 2-1 pitch to the wall in dead-center field.
The ball hit off the wall and was thrown into the infield, where Willingham was tagged out at the plate.
Replays showed that the Willingham hit was actually a home run. Because instant replay is allowed on home run calls, and because Nationals manager Jim Riggleman asked for a replay, the play was eventually reversed. The Nationals went on to win the game 5-2.
This is just one of many examples. Instant replay works.