Saint-Amand-Montrond (France): Mark Cavendish won the 13th stage of the Tour de France in a sprint finish on Friday and Chris Froome lost a sizeable chunk of his overall lead after being caught out by an attack from rival Alberto Contador.Cavendish moved ahead with about 100 metres to go and rival Peter Sagan, who leads the contest for the best sprinter’s green jersey, was unable to stay with him.It was the British sprinter’s second stage win of this year’s Tour and 25th overall — moving him level in third place with Frenchman Andre Leducq on the all-time list.Aside from Cavendish, Contador was the big gainer of the stage.