The International Cycling Union said Friday a second sample confirmed elite cyclist Frank Schleck of Luxembourg failed a doping test.
Peter Sagan won his third stage of the 2012 Tour de France Friday and half the field was caught up in a huge crash 25 kilometers from the finish.
Andy Schleck, with a daring charge up Thursday's final climb, nearly took the overall lead in the 2011 Tour de France with a victory in the race's Stage 18.
Thomas Voeckler holds the overall leader's yellow jersey as the 98th Tour de France moves into its final week.
Thomas Voeckler of France maintained the lead in the Tour de France Saturday after finishing among the leaders in the mountainous Stage 14.
Alberto Contador tied for the best time in Wednesday's 17th stage of the Tour de France and increased his overall lead to nearly 2 1/2 minutes.
Carlos Sastre won the 17th stage of the Tour de France by more than 2 minutes Wednesday, earning his first stage win in five years and the overall tour lead.
Frank Schleck takes a 7-second lead into the final six stages of the 2008 Tour de France.
Austrian Simon Gerrans raced to victory in the 15th stage and Luxembourg's Frank Schleck moved into the overall lead Sunday in the Tour de France.
Oscar Freire of Spain dashed to a win in the Tour de France's 14th stage Saturday but Australia's Cadel Evans clung to the yellow leader's jersey by one second.