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. From fifth on the grid, Bagnaia had a bad start as he dropped to ninth on the opening lap but the Italian fought back to slowly make his way to the top. With 15 laps to go, Bagnaia...