NAPLES, Italy (Reuters) -Napoli missed the chance to move a provisional six points clear atop Serie A after being held to a 1-1 draw at home to Udinese on Sunday, their second successive stalemate. Napoli, who had to settle for a 1-1 draw at AS Roma last week, now have 55 points, four clear of second-placed Inter Milan, who host Fiorentina on Monday. Udinese are 10th on 30. In an eventful first