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    Top 15 KOs in boxing history

    On the heels of one of the most devastating knockouts in boxing history, Yahoo! Sports analyst Kevin Iole gives his top 15 KOs of all-time. Where does Juan Manuel Marquez's knockout of Manny Pacquiao rank in history?

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    1. 15. Manny Pacquiao KO2 Ricky Hatton, May 2, 2009 – Hatton was expected to provide a stiff test for Pacquiao, but he was completely outclassed. He entered the fight with a 45-1 record, but was battered
    2. 14. Jack Dempsey KO2 Luis Angel Firpo, Sept. 14, 1923 – The fight was a wild brawl and Dempsey had Firpo on the floor seven times in the first round. But Dempsey was down twice and once was knocked th
    3. 13. Sugar Ray Robinson KO5 Gene Fullmer, May 1, 1957 – Four months earlier, Robinson lost the middleweight title to Fuller in New York. They rematched in Chicago and Fullmer was again doing well when
    4. 12. Diego Corrales TKO10 Jose Luis Castillo, May 7, 2005 – The first nine rounds were incredible, but the 10th is one of the all-time greats. Castillo knocked Corrales down twice early in the round an
    5. 11. Jack Johnson KO12 Stanley Ketchel, Oct. 16, 1909 – Johnson was the heavyweight champion and Ketchel the middleweight champion, but the knockout was one of the most brutal ever. First, the power-pu
    6. 10. Mike Tyson KO1 Michael Spinks, June 27, 1988 – This fight was Tyson at his peak, as he terrorized a petrified Spinks. It was a matchup of two unbeaten men holding heavyweight belts, but Spin
    7. 9. Buster Douglas KO10 Mike Tyson, Feb. 10, 1990 – Tyson was a 42-1 favorite to defend his IBF/WBA/WBC heavyweight titles, but he was in trouble right from the start. He had a powerful jab that
    8. 8. Thomas Hearns KO2 Roberto Duran, June 15, 1984 – Hearns showed his power in this fight, dropping Duran twice in the first and ending the fight with a blistering straight right in the second t
    9. 6. Rocky Marciano TKO13 Jersey Joe Walcott, Sept. 23, 1952 – This fight marked the start of Marciano's reign as heavyweight champion. He was far behind on points, but caught Walcott on the chin wi
    10. 5. Marvelous Marvin Hagler KO3 Thomas Hearns, April 15, 1985 – Regarded by many as the best short fight in boxing history, Hagler was too powerful for Hearns and proved it in this all-out slugfe
    11. 4. Joe Louis TKO1 Max Schmeling, June 22, 1938 – With tensions rising between the U.S. and Germany because of the Hitler regime's aggressive foreign policy, the fight had societal, as well a
    12. 3. George Foreman KO10 Michael Moorer, Nov. 5, 1994 – Foreman was 45 years old and trying to regain the heavyweight title. He was being badly outboxed by Moorer throughout the first nine rounds,
    13. 2. George Foreman TKO2 Joe Frazier, Jan. 22, 1973 – Frazier entered the bout as the champion, with a record of 29-0 with 25 knockouts. Foreman was 37-0 with 34 knockouts. It promised to be an action-p
    14. 1. Muhammad Ali KO8 George Foreman, Oct. 30, 1974 – The bout was known as "The Rumble in the Jungle," and was held in Kinshasa, Zaire, now known as The Congo. Ali was seen as on the do