Lazzari began playing football in the talent of Atalanta Bergamo. There he was admitted to the senior squad in 2002 and played 68 games in four years ( five goals). After three lending to AC Cesena to Piacenza Calcio U.S. Grosseto in 2008 he moved to Cagliari Calcio. For the Sardinians he played three years in the Serie A, before he moved to Fiorentina. Since 2012 he is awarded to Udinese Calcio.
From 2004 to 2007 Lazzari ran nine times on the U -21 in Italy.