On October 9, 1964, a 22-year-old Carlos Monzón (16-2, 14 KOs) and Alberto Massi met in the ring.
Monzón came in to the fight on a 5-fight win streak with a 77% KO rate, and was fighting after a gap of 14 days.
Carlos Monzón lost to Alberto Massi via unanimous decision in the 10-round fight, and adds an loss to his record at 16-3.
On June 28, 1964, a 21-year-old Carlos Monzón (11-1, 10 KOs) and Felipe Cambeiro met in the ring.
Monzón came in to the fight on a 4-fight win streak with a 83% KO rate, and was fighting after a gap of 15 days.
Carlos Monzón lost to Felipe Cambeiro via points decision in the 8-round fight, and adds an loss to his record at 11-2.
On August 28, 1963, a 21-year-old Carlos Monzón (7-0, 7 KOs) and Antonio Aguilar met in the ring.
Monzón came in to the fight on a 7-fight win streak with a 100% KO rate, and was fighting after a gap of 19 days.
Carlos Monzón lost to Antonio Aguilar via points decision in the 10-round fight, and adds an loss to his record at 7-1.