On August 21, 1999 — Joining Mark McGwire, Ken Griffey Jr., and Babe Ruth, Sammy Sosa becomes the fourth player to hit 50 home runs in consecutive seasons. The Cubs right fielder, who hit 66 dingers last season, blasts his major league leading 50th and 51st home runs in an 8-6 victory over the Rockies at Wrigley Field.


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Sources:
Baseball Reference August 21
National Pastime August 21
Retro Sheet
Hall of Fame
SABR Games Project
Replay The Game