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American boxing champion Rocky Marciano, who retired as undefeated World Heavyweight champion, shows new British professional Pat Dwyer how to lead, at the Cambridge gym, in London, in 1965 Stock Photo - Alamy
Rocky Marciano retires from boxing as heavyweight champion - Sports Illustrated
JOE LOUIS UNDEFEATED WORLD HEAVYWEIGHT BOXING CHAMPION, RARE EDITION | eBay
HEAVYWEIGHT WORLD CHAMPION DEONTAY WILDER DEFENDS TITLE AGAINST UNDEFEATED CUBAN CONTENDER LUIS ORTIZ MARCH 3 IN BROOKLYN
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Des Moines, Iowa- Undefeated world heavyweight boxing champion Rocky... News Photo - Getty Images
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Premier Boxing Champions on ESPN Presented by Corona Extra Features 12-Round Featherweight Bout: Undefeated World Champion Leo Santa Cruz vs. Former Three-Division World Champion Abner Mares - ESPN Press Room U.S.
Josh Taylor beats Jose Ramirez to become Britain's first undisputed world boxing champion | UK News | Sky News
Gleason's Gym - #TBT: #Boxing History. 1956: #Undefeated World #Heavyweight #Champion Rocky Marciano, announces his retirement from the ring with a career log of 49-0 (43). | Facebook
