Major League Baseball teams unanimously approved the expansion of instant replay Thursday, and the changes will be in effect for the 2014 regular season and postseason.
Managers will start each game with one challenge. If correct on the first challenge, they would receive a second. Additionally, umpire crew chiefs can invoke replay starting in the seventh inning if challenges run out. The replay command center will be at MLB headquarters in New York and won't be handled by individual stadiums. The on-site umpires will not have video access to replays and will not leave the playing field to seek replay footage.