The 7-foot Russian ( left ) won a 12-round majority decision against WBA heavyweight champion John Ruiz in 2005 to become the tallest and heaviest champion in boxing history.
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"The Ambling Alp" stopped Jack Sharkey in the sixth round to win the world heavyweight title on June 29, 1933.
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Lewis recaptured the WBC heavyweight title with a fifth-round TKO of Oliver McCall on Feb. 7, 1997.
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"The Nigerian Nightmare" earned the WBC heavyweight title with a sixth-round TKO of Oleg Maskaev on Mar. 8, 2008.
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The 45-year-old Foreman, who had weighed just 217½ when he stopped Joe Frazier for the title in 1973, tipped the scales at 250 for his historic knockout victory over Michael Moorer on Nov. 5, 1994.
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After three losses in heavyweight title fights, the south Londoner finally broke through near the end of his career. At 33, Bruno outpointed Oliver McCall for the WBC heavyweight title at Wembley Stadium on Sept. 2, 1995.
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The elder Klitschko brother captured the WBO heavyweight title with a second-round knockout of Herbie Hide on June 26, 1999.
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Vitali's younger brother won the IBF heavyweight title with a seventh-round TKO of Chris Byrd on Apr. 22, 2006.
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"The Quiet Man" ( right ) outpointed Hasim Rahman for the interim WBA heavyweight title on Dec. 13, 2003.
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Tate, a bronze medalist for the United States at the 1976 Olympics in Montreal, won the vacant WBA heavyweight title on Oct. 20, 1979, going on the road to beat Gerrie Coetzee in Pretoria, South Africa.
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