FC Porto the 1955–56 Primeira Divisão on head-to-head advantage over runners-up Benfica. Later that season, Porto beat Torreense to win its first Taça de Portugal and achieve its first double. As the Portuguese league winner, Porto made its debut in European competitions by qualifying for the 1956–57 European Cup. The club's first participation was short-lived, ending in the preliminary round with two defeats against Spanish champions Athletic Bilbao. A year later, Porto lifted its second Taça de Portugal by beating Benfica 1–0 in the final. The two clubs met again in the following season's final, but this time Benfica took the trophy
1977–78 S.L. Benfica season top of the table by Porto, which had a game in hand. Three days later, Benfica lost 4–1 in Anfield Road and were eliminated of the European Cup. Toni said the result expressed the difference between both teams. Back at domestic competition, Benfica regained their footing and won the following two matches. However, on 8 April, they drew again, at home with Portimonense and fell to second, a point from Porto. They responded with two more wins, before conceding another draw, the eight all season, against Braga. This opened Porto's lead to two points with five matches to go. As