Norberto Cabrera, and two more fights against Saavedra. His first rematch with Saavedra, on September 27, marked Corro's Buenos Aires debut. Corro was able to avenge his first defeat when he outpointed Saavedra over ten rounds. Their third bout, held on March 5, 1976 at Córdoba, ended when Saavedra was disqualified in the tenth round. After a win against Roque Roldan, Corro met Norberto Cabrera for a second time. On May 21, he lost to Cabrera by a ten-round decision, in Buenos Aires. Corro, however, once again bounced back well, winning his next seven fights by knockout, including a rematch with Juan Carlos Artaza, who was beaten in round ten on September 10. On December 10, he got his first shot at a title, when he fought Julio Medina for the vacant Argentine middleweight title. Corro won the national championship by knocking Medina out in round three of a fight that was scheduled for twelve rounds. After two victories over Rodolfo Rosales, Corro had his first fight abroad, boxing against Marcelo Quinones on May 9, 1977, for the South American middleweight title, in Lima, Peru. He conquered the continental championship by decisioning Quinones over twelve rounds. The win also earned him a spot among the world's top ten middleweight challengers for the first time. Corro followed that win with seven more victories, including title defenses of both his Argentine and his South American middleweight titles, before he got his first opportunity at becoming world champion: on April 22, 1978, Corro became the undisputed world middleweight champion by beating Valdez by a fifteen-round decision in Italy. His first world title defense came against Ronnie Harris, on August 5, back in Argentina. He outpointed Harris over fifteen rounds, and then, on November 11, he retained the title in his rematch with Valdez, by a fifteen-round decision at Buenos Aires. He traveled to Monte Carlo, where Monzon defended his title a few times, to face Vito Antuofermo for his third world title defense. Corro lost the title on June 30 of 1979 in a fight that was actually held at Monaco's royal palace. Corro in reality lost his title by only one point, as Antuofermo beat him by a split decision, and each judge had a one-point difference on their scorecard (scores of 146-145, 145-146 and 142-143). Asked about the fight during the press conference that followed it, Corro answered "I only had