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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
Undefeated heavyweight Tyson Fury returns to the ring against Christian Hammer in the New Year | Boxing News | Sky Sports
Beterbiev Still Undefeated and the Unified Light-heavyweight Champion – Rival Boxing Gear USA
Max Boxing - Sub Lead - Undefeated heavyweight Agit Kabayel signs promotional contract with Top Rank
Sports Heroes Who Served: Undefeated Boxing Champ Served in World War II > U.S. Department of Defense > Story
This Undefeated Boxer Has a Shot at Becoming China's First Heavyweight Champion
Chapter III: Undefeated Heavyweight Champion Tyson Fury Meets Former Champion Deontay Wilder in Las Vegas For Epic Summer Showdown – Top Rank Boxing
Rocky Marciano The only world heavyweight boxing champion to retire undefeated, his 49 victories featured 43 knockouts and … | Boxing champions, Boxer, Sports hero
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HEAVYWEIGHT WORLD CHAMPION DEONTAY WILDER DEFENDS TITLE AGAINST UNDEFEATED CUBAN CONTENDER LUIS ORTIZ MARCH 3 IN BROOKLYN
On This Day - Apr 27 1956: Rocky Marciano retires as undefeated heavyweight boxing champion of the world - The Irish News
List of the 10 greatest heavyweight boxers of all time: Has Tyson Fury done enough to make the cut? | DAZN News US
Max Boxing - Sub Lead - Artur Beterbiev heads to London to defend light heavyweight titles
Frank Sanchez, the emerging Cuban heavyweight force, stayed unbeaten by outpointing Christian Hammer | Boxing News | Sky Sports
Ranking the 10 Most Accomplished Heavyweight Champions in Boxing History | News, Scores, Highlights, Stats, and Rumors | Bleacher Report
When Ali met Marciano in a battle of undefeated heavyweights
The Only Boxing Champions in History to Retire Undefeated | HowStuffWorks
Rocky Marciano Tribute | Undefeated Heavyweight Boxing Champion - YouTube
Undefeated Light Heavyweight Champion Andre Ward Announces Retirement
Tyson Fury: The Heavyweight Champion We've Been Waiting For | The New Yorker
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Unbeaten Heavyweight David Adeleye Vows to Become a Future Champion
The Boxing Glove: On This Day: Rocky Marciano Retires As Undefeated Heavyweight Champion
Heavyweight Champion Tyson Fury Faces Dillian Whyte in London - The New York Times
