CAMBRAI, France (AP) -- German rider Tony Martin won the fourth stage of the Tour de France to take the overall lead, while Chris Froome and his main rivals safely came through the treacherous cobblestones on Tuesday.
Martin, one second behind Froome overall before the stage started, broke away from Froome's yellow jersey group some 3 kilometers (2 miles) from the end.
Froome and others let him go, knowing that Martin is not a Tour contender.
Defending Tour champion Vincenzo Nibali, who built last year's win on the back of a brilliant performance on the slippery cobbles, tried and tried again to crack Froome's resistance over the seven paved sections.
But Froome, who crashed out of last year's Tour on the fifth stage after three falls in two days, held his nerve well.