In 1923 Luis Firpo knocked this heavyweight champ out of the ring in the first round but was KO'd in the second round
Ultimately, Dempsey beat Argentinian contender Luis ngel Firpo with a second-
round... [DOC] [TLE] Jack Dempsey vs. Luis Angel Firpo - BoxRec [PAR] Oct 17, 2014 ... Firpo was down seven times in the first round and Dempsey was down ... Firpo 
the second most exciting round in boxing history.