MILAN (Interstat) — Parma opened its Serie A season with a 1-0 upset victory over AC Milan on Sunday at Stadio Giuseppe Meazza. Substitute Mariano Troilo scored the game’s only goal in the 80th minute, converting after an assist from Alexis Saelemaekers. The result defied pregame projections that favored the hosts. AC Milan, which began its league campaign with a loss, saw forward Rafael Leão receive a yellow card. Troilo and Saelemaekers were also booked in a match featuring few clear chances. The victory gives Parma a winning start in Italy’s top flight.