He competed in international competitions between 2000 and 2011. In the 2007/08 season he also took part in two races of the cross-country skiing world cup . His best result was a 19th place over 50 kilometers freestyle in Oslo , the other race over 15 kilometers in classic style in Otepää , Estonia , he finished 52nd. In December 2006 he finished second at La Sgambeda . In the Alpine Cup he came third three times and second three times. In February 2007 he achieved his only victories in the Alpine Cup in Medvode over 10 km freestyle and in the mass start race over 30 km. His best overall result was fourth place in the 2007/08 season .
Fiorentini completed his last official FIS race on February 13, 2011.