By Alasdair Fotheringham IVREA, Italy (Reuters) - Italy's Vincenzo Nibali fended off several surprise attacks by his rivals to maintain his grip on the overall lead for a ninth straight day on Tuesday's hilly 16th stage of the Giro d'Italia, won by Spain's Benat Intxausti. In a fast and frantic finale as the main pack tore down a twisting descent from the third category climb of Andrate, Nibali responded to attacks by 2011 Giro winner Michele Scarponi, fifth overall. ... More...