May 29 (Reuters) - Ducati's Francesco Bagnaia held off a spirited challenge from reigning world champion Fabio Quartararo of Yamaha to win the Italian Grand Prix in front of his home fans at the Mugello Circuit on Sunday. Bagnaia started fifth on the grid and, with 15 laps to go, overtook Marco Bezzechi of Mooney VR46 Racing Team in the first spot with a brilliant move heading into Turn 1. The Italian held...