Which Portuguese football club is considered S.L. Benfica's main rival?
FC Porto
Sporting CP
Vitória SC
Braga
Answer
S.L. Benfica's main rival is FC Porto. The two clubs have a long-standing rivalry in Portuguese football, with their matches often referred to as "O Clássico." As president of S.L. Benfica, Manuel Vilarinho was deeply involved in this rivalry.
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