At last, MLB umpires will communicate with fans about replay
Another new MLB rule? Get ready for replay on speed dial. Some managers are wary - The Athletic
Umpire (baseball) - Wikipedia
MLB umpires to announce replay review decisions to fans - ESPN
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MLB umpires may get on-field microphones to explain replay review outcomes - Bless You Boys
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MLB umpires to use microphones to announce replay review decisions - Sports Illustrated
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Major League Baseball approves expanded instant replay, managers can challenge up to two calls a game – New York Daily News