NEW YORK -- Major League Baseball reversed its long-standing opposition to instant replay and will allow umpires to check video on home run calls in series that start Thursday.
Commissioner Bud Selig was scheduled to make the announcement at 5 p.m. ET Tuesday.
Three series are scheduled to start Thursday, with Philadelphia at the Chicago Cubs, Minnesota at Oakland and Texas at the Los Angeles Angels. For other games, replays will be available to umpires starting Friday.
The start date comes nearly 10 months after general managers voted 25-5 to use the technology and following MLB agreements with the unions for umpires and for players.
For now, video will be used only on so-called "boundary calls," such as determining whether fly balls went over the fence or whether potential home runs were fair or foul.
Video will be collected at the office of Major League Baseball Advanced Media in New York. If the crew chief at a game decides replay needs to be checked, umpires will leave the field, technicians at MLBAM will show umpires the video and the crew chief will make the call.
Baseball had been the last holdout among the major professional sports in the United States. Replays were first used in the NFL in 1986.
In the NHL, video review has been in place since the 1991-92 season to check whether the puck crossed the goal line completely, went in before time expired or the net was dislodged and wasn't kicked or batted in intentionally.
In the NBA, replays have been viewed since the 2002-3 season to decide whether players got off shots before time expired and since last season to aid decisions following altercations and flagrant fouls. In Grand Slam tennis tournaments, a Hawk-Eye system has been used to decide close line calls since the 2006 U.S. Open.
International soccer has refused to embrace aiding referees, with FIFA's International Board voting last March to stop all experiments with technology that could determine whether balls cross goal lines.