Julio César Cortés

After one season with Rosario, Cortés returned to Uruguay to join Peñarol in 1966, and became part of a first team that included players like Pedro Rocha, Alberto Spencer, Julio César Abbadie, and Omar Caetano. The team went on to win the Copa Libertadores in 1966, with Cortés scoring a decisive goal against arch-rivals Nacional in the semifinal playoff on April 23, 1966, which allowed the team to reach the final where they defeated Argentine's River Plate after three matches, obtaining their third Copa Libertadores.[4] Later that year, Cortés helped Peñarol to defeat Spanish champions Real Madrid to win the Intercontinental Cup title. While Cortés was playing for the club, Peñarol also won the domestic league championship in 1967 and 1968.[5]

Cortés joined Mexican Primera División side Atlante F.C. in 1973.[6]

From 1962 to 1970, Cortés appeared in 30 international matches for Uruguay, scoring 3 goals.[7] He made his international debut on 2 May 1962 in a 3–2 victory against Scotland in Glasgow shortly before the 1962 World Cup, at which he played in one match. He also appeared at the 1966 and 1970 finals, being one of six Uruguayan players to be part of three World Cup squads.[8]

At the 1966 World Cup, Cortés scored the eventual match-winning goal against France, one of the two goals Uruguay scored in that match and in the entire tournament. Uruguay was eliminated in quarterfinals by West Germany.

Four years later in Mexico, he played all of Uruguay's six matches, as the team reached semifinals, where they lost to Brazil. With the consolation match against West Germany, Cortés reached an overall total of 11 World Cup matches played, Uruguay's second-highest mark behind goalkeeper and Peñarol teammate Ladislao Mazurkiewicz's 13. The match against the Germans was also his last international match.

In 1987, Cortés was named head coach of the Guatemala national team, managing it at that year's Pan American Games. This tenure lasted just over one year until he was replaced by Jorge Roldán in April 1988. Cortés' second period as Guatemala's manager began in June 2000, and ended three years later, in what is one of the longest uninterrupted tenures for a coach of the Guatemalan team. During that time, Guatemala failed to qualify to the 2002 World Cup, but won the 2001 UNCAF Nations Cup – its first international title in 34 years – and finished runner up of that tournaments two years later.

Dispute with the Guatemalan Federation

After being removed from the charge of national coach in April 2003, Cortés sued the Guatemalan football federation (FEDEFUT) for breach of contract, demanding payment of part of his remuneration as national team coach. The coach took the case before FIFA, whom in 2006 ruled that the FEDEFUT pay him part of what he demanded.[10] In September 2006, the FEDEFUT reacted against the coach, accusing him of fraud before a local court, whom dictated that Cortés – who was at the time living in Costa Rica and was at the moment in Guatemala – remained in the country.[11]