On August 26, 2001 — Joining Babe Ruth (1920-21 and 1927-28) and Mark McGwire (1996-99), Sammy Sosa (1998-2001) becomes the third player in baseball history to hit 50 homers in a season four times.
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Sources:
Baseball Reference August 26
National Pastime August 26
Retro Sheet
Hall of Fame
SABR Games Project
Replay The Game