By Alasdair Fotheringham TARAZONA, Spain (Reuters) - Vincenzo Nibali of Italy overcame a wasp sting to regain the overall lead the Tour of Spain following the individual time trial on Wednesday. Astana's Nibali completed the 38.8-kilometre rolling course in fourth place, one minute 25 seconds behind stage winner Fabian Cancellara of Switzerland, with Tony Martin of Germany second and Italy's Domenico Pozzovivo third. As the race reaches its half-way point, Nibali leads overall by 33 seconds from Ireland's Nicolas Roche with Spain's Alejandro Valverde third. ... More...