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
1979–80 S.L. Benfica season August, but Benfica postponed it four days, so they could play a friendly abroad. On the 29, Benfica won 5–1 and Jorge Gomes made his historical debut. After the 0–0 draw in Clássico on match-day 3, Benfica shared first place with Porto with five points. However, in the UEFA Cup, the campaign was disappointing, with Benfica unexpectedly losing to Aris on the first round. On the league, Benfica dropped to second after a draw with União de Leiria, but managed to recover and catch Porto on match-day 8. A week later, they beat Sporting in the Derby de Lisboa, reaching