In 1997, Zambrotta's Serie A career began when his great potential was spotted by Bari boss Eugenio Fascetti. Zambrotta was snapped up by Fascetti after Bari had won promotion to Serie A. He made his Serie A debut on 31 August 1997 in a 2–0 home defeat to Parma, and in his first year in the top flight, he played on the left wing and scored 2 goals in 27 appearances. In the 1998–99 season, following the departure of Nicola Ventola, Zambrotta exploded on to the scene. In matchday one, he scored the only goal of the match against Venezia after just nine minutes into the first half. Zambrotta continued to shine and was the key figure for Bari's surprise start to the campaign, demonstrating his technical attributes and tactical intelligence and versatility. On matchday seven, he scored the opening goal at the San Siro and helped Bari to win the game 3–2 against Internazionale.