MLB Umpires Will Be Mic'd Up to Explain Replay Reviews This Season - Bleacher Nation
Angel Hernandez wasn't even close on this call at first base
MLB News: Umpires Will Wear Microphones During Reviews
Dodgers Dugout: The MLB rules changes you need to know about - Los Angeles Times
MLB umpire hospitalized after being hit in head by throw - Los Angeles Times
MLB umpires to use microphones to announce replay review decisions - Sports Illustrated
Half of MLB video review challenges led to overturned calls - NBC Sports
MLB expanded replay approved; no decision on home-plate collisions ban
Major League Baseball approves expanded instant replay, managers can challenge up to two calls a game – New York Daily News
MLB umpires to make announcements on replay reviews for first time