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
FC Porto for the first time. The 2006–07 Primeira Liga title was only secured in a frantic final day, as Porto finished one point above Sporting and two above Benfica. In the following season, the club achieved the "Tri" for the second time in its history – with López clinching the top goalscorer award –, but lost the Taça and Supertaça finals to Sporting CP. As result of a legal investigation on match fixing in Portuguese football, Porto was punished with the loss of six points, which did not affect its final league classification. Having claimed a sixth league and cup double