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
S.L. Benfica (basketball) the League Cup and the Super Cup but did not renew the championship as it lost 4–3 in the final to Porto. In the next season Benfica regained the title of Portuguese champion after defeating Porto in their home court Dragão Caixa (53–56) in the last best-of-five series game following a 2–2 playoff tie. Benfica retained the title the following season, having only lost two games, one in the regular season, and the other in the play-off final, which they won 3–1 against Académica de Coimbra, both defeats coming only in overtime. Overall Benfica won every title except the Cup,