SAINT-QUENTIN, France — In yet another crash-marred finish, Andre Greipel of Germany led a frenzied bunch sprint to win the fifth stage of the Tour de France on Thursday for his second straight stage victory.

Fabian Cancellara retained the overall leader's yellow jersey for a sixth straight day after the mostly flat 122-mile trek from Rouen to Saint-Quentin — almost tailor-made for sprinters except for a slight uphill near the end.

But the Tour's doping demons returned to cast a shadow. A Dutch newspaper report said former teammates of Lance Armstrong — including five involved in this year's race — cut a deal with U.S. anti-doping officials for their testimony in a case against the seven-time Tour champion. As usual, the Tour riders tried to keep their focus on the race.

Citing "well-informed sources," the newspaper said the U.S. Anti-Doping Agency has given six-month bans to former Armstrong teammates Jonathan Vaughters, George Hincapie, Levi Leipheimer, David Zabriskie and Christian Vande Velde.