NEW YORK -- AP -- In addition to "Play ball!" and "Yer Out!", big league umpires will be heard saying "Overturned!" and "Upheld!" for the first time this season. Major League Baseball say umps will conduct in-park announcements during the replay review process. MLB was the last major pro sport in North America to institute replay when it began late in the 2008 season for home run calls.

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Video reviews were vastly expanded for the 2014 season. Until now, umpires had revealed their decisions such as safe and out with hand signals. There were 1,305 calls challenged by clubs last year.

LOOK: MLB history from the year you were born

Stacker compiled key moments from Major League Baseball's history over the past 100 years. Using a variety of sources from Major League Baseball (MLB) record books, the Baseball Hall of Fame, and audio and video from events, we've listed the iconic moments that shaped a sport and a nation. Read through to find out what happened in MLB history the year you were born.