On September 25, 2017 — 2017 – By hitting two homers in an 11 – 3 win over the Royals, the Yankees’ Aaron Judge reaches the 50 mark for the season, breaking the rookie record of 49 set by Mark McGwire in 1987.
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Sources:
Baseball Reference September 25
National Pastime September 25
Retro Sheet
Hall of Fame
SABR Games Project
Replay The Game