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On this day in 1952: Rocky Marciano became World Heavyweight Champion with a KO to Jersey Joe Walcott; Watch
Ashleigh Barty retires: Bjorn Borg and other star athletes who called it quits at a young age
Floyd Mayweather confirms permanent retirement from boxing after 50th straight victory
'I've accomplished everything': Floyd Mayweather bows out with 49-0 record after defeating Berto
