On August 27, 2001 — With his 17th dinger this month, Cubs slugger Sammy Sosa ties the National League record for August homers established by Willie Mays in 1965. Tiger Rudy York set the major league mark going yard 18 times in the eighth month of 1937.


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Sources:
Baseball Reference August 27
National Pastime August 27
Retro Sheet
Hall of Fame
SABR Games Project
Replay The Game