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
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Wilder closing on longest-ever heavyweight unbeaten run and is seven wins away from legend Marciano – The Sun | The Sun
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Rocky Marciano The only world heavyweight boxing champion to retire undefeated, his 49 victories featured 43 knockouts and … | Boxer, Boxing champions, Sports hero
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