By JEROME PUGMIRE GOURETTE, France - The Tour de France sustained a new blow Wednesday after a senior French doping official said yet another rider failed a doping test - this time for testosterone.

Dozens of Tour de France riders demonstrated their anger over repeated doping scandals by not starting the 16th stage at the scheduled time Wednesday.

Juan Mauricio Soler became the latest Colombian to show climbing prowess at the Tour de France, attacking in the last of three major ascents and holding off a pack of chasers to win the ninth stage on Tuesday.

Linus Gerdemann hadn't even finished celebrating his first Tour de France stage victory before sounding a loud drumbeat from the winner's circle: Races can and should be won clean.

By JAMEY KEATEN AUTUN, France - Filippo Pozzato of Italy won the fifth stage of the Tour de France on Thursday, and Swiss rider Fabian Cancellara held on to the leader's yellow jersey for the sixth straight day.