Conti was part of the Italian national side that won the 1982 FIFA World Cup in Spain, featuring in every match of the tournament, and scoring a goal in Italy's first round draw against Peru. In the final against West Germany, despite being booked after 31 minutes, he was a central figure in Italy's second goal that was scored by Marco Tardelli, and he single-handedly created Italy's third goal by breaking down the right side from the half-way line through the German defence, and crossing the ball to Alessandro Altobelli, who scored from the top of the box after 81 minutes. He also won a penalty for Italy during the match, which Cabrini failed to convert, however. The Italians won the final game 3–1 and they were awarded their third World Cup title. Conti was elected to be part of the team of the tournament for his performances. Due to his pace, flair, creativity, influence, and technical ability, Conti was given the nickname "Mara-Zico" throughout the World Cup (a reference to the players Maradona and Zico); at the conclusion of the tournament, Pelé stated that he believed that Conti had been the best player of the tournament, and that he was one of the best players in the world.