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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 through the ropes. In the second, Dempsey blasted out Firpo, stopping him in the first minute of the round to retain the heavyweight title. (Photo credit: Getty)