After three years of breaking in at Atalanta in his early career, Mari played four seasons with Juventus, winning two Serie A championships, playing alongside the great Carlo Parola. Before the 1954 World Cup, he went to Sampdoria and then concluded playing in Serie A with Padova.
A tireless runner, Giacomo Mari was a classic halfback, waiting in the folds of midfield ready to halt the attack of the opposing forwards and wings.[citation needed]
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