1. Muhammad Ali
Record: 56-5, 37 knockouts
Titles: World heavyweight champion, 1964-1967; WBA-WBC heavyweight champion 1974-1978; WBA heavyweight champion 1978.
Notable victories: Sonny Liston twice, Joe Frazier twice, Floyd Patterson twice, Ken Norton twice, Jerry Quarry twice, George Foreman, Jimmy Ellis and Archie Moore. Notable losses: Joe Frazier, Ken Norton, Leon Spinks, Larry Holmes.
Most memorable bouts: Ali knocked out the seemingly invincible Foreman in the eighth round in 1974 in what was known as ‘The Rumble in the Jungle†in Kinshasha, Zaire. He also stopped Frazier after 14 rounds in an epic battle in Manila, Philippines, in 1975.
2. George Foreman
Record: 76-5, 68 knockouts
Titles: WBA-WBC heavyweight champion, 1973-1974; IBF-WBA heavyweight champion, 1994-1995.
Notable victories: Joe Frazier twice, Ken Norton, Ron Lyle, Michael Moorer.
Notable defeats: Muhammad Ali, Jimmy Young, Evander Holyfield.
Most memorable bout: At 45, Foreman became the oldest heavyweight
champion ever when, after losing every minute of every round, he knocked out Michael Moorer in Las Vegas to win the title 20 years after he had lost it to Ali.
3. Joe Louis
Record: 69-3, 55 knockouts
Titles: World heavyweight champion, 1937-1950
Notable victories: Jersey Joe Walcott twice, Billy Conn twice, Jim Braddock, Max Schmeling, Primo Carnera, Max Baer.
Notable defeats: Max Schmeling, Ezzard Charles, Rocky Marciano
Most memorable bout: Knocked out Schmeling in an emotionally charged rematch in the first round in 1938 as tensions between the U.S. and n**i Germany were heightening.
4. Rocky Marciano
Record: 49-0, 43 knockouts
Titles: World heavyweight champion, 1952-1955.
Notable victories: Jersey Joe Walcott twice, Ezzard Charles twice, Joe Louis, Archie Moore.
Notable defeats: None. Only champion to finish his career undefeated.
Most memorable bout: In his first bid for the title in 1952, Marciano was well behind on the scorecards when he rallied to knock out Walcott in the 13th round.
5. Larry Holmes
Record: 69-6, 44 knockouts
Titles: WBC heavyweight champion 1978-1983; IBF heavyweight champion 1984-1985.
Notable victories: Earnie Shavers twice, Muhammad Ali, Ken Norton, Gerry Cooney and Mike Weaver.
Notable defeats: Michael Spinks twice, Mike Tyson, Evander Holyfield.
Most memorable bout: Won vacant WBC title in 1978 by besting Ken Norton in a split decision in arguably the most exciting heavyweight bout ever. The bout was even on all cards heading into the 15th round. Two judges scored it for Holmes and the other had it for Norton.
6. Jack Johnson
Record: 77-13-14, 48 knockouts, 19 no decisions
Titles: World heavyweight champion, 1908-1915.
Notable victories: Tommy Burns, Sam Langford, Stanley Ketchel, James J. Jeffries.
Notable defeats: Jess Willard.
Most memorable bout: Lost his title when he was knocked out by Willard in Havana in the 26th round of a 45-rounder.
7. Lennox Lewis
Record: 41-2-1, 32 knockouts
Titles: WBC heavyweight title, 1993-1994; WBC heavyweight title 1997-2001; IBF heavyweight title, 1999-2001; WBA heavyweight champion, 1999-2001; WBC heavyweight champion, 2001-03; IBF heavyweight champion, 2001-02. br> Notable victories: Mike Tyson, Evander Holyfield, Vitali Klitschko, Hasim Rahman, Ray Mercer, Tommy Morrison, Oliver McCall, Frank Bruno.
Notable defeats: Oliver McCall, Hasim Rahman.
Most memorable bout: Dominated Mike Tyson before stopping him in eighth round on 2002 bout.
8. Joe Frazier
Record: 32-4-1, 27 knockouts
Titles: World heavyweight title, 1968-1973
Notable victories: Jerry Quarry twice, Jimmy Ellis twice, Muhammad Ali.
Notable defeats: Muhammad Ali twice, George Foreman twice.
Most memorable bout: Knocked Muhammad Ali down in the 15th round in 1971 in Madison Square Garden in New York to punctuate a unanimous decision in the most hyped boxing match ever.
9. Mike Tyson
Record: 50-6, 44 knockouts
Titles: WBC heavyweight title, 1986-1990; IBF-WBA heavyweight title, 1987-1990; WBA-WBC heavyweight title, 1996.
Notable victories: Frank Bruno twice, Razor Ruddock twice, Michael Spinks, Larry Holmes, Tony Tubbs, Tony Tucker.
Notable defeats: Evander Holyfield twice, Buster Douglas, Lennox Lewis.
Most memorable bout: Bit a chunk out of Evander Holyfield’s ear during a 1997 title rematch; Tyson was disqualified and lost his boxing license in a later disciplinary hearing.
10. Jack Dempsey
Record: 66-6-11, 51 knockouts
Titles: World heavyweight title, 1919-1926
Notable victories: Jess Willard, Tommy Gibbons, Luis Angel Firpo, Georges Carpentier, Jack Sharkey.
Notable defeats: Gene Tunney twice.
Most memorable bout: Lost the infamous “Long Count†bout to Tunney in 1927. Dempsey knocked Tunney down in the seventh and failed to go to a neutral corner, giving Tunney critical extra seconds before the referee began the count. Dempsey long claimed Tunney had been down 14 seconds and not nine
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