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Stage winner Mark Cavendish of Britain celebrates on the podium of the thirteenth stage of the Tour de France cycling race over 173 kilometers (108.1 miles) with start in in Tours and finish in Saint-Amand-Montrond, western France, Friday July 12 2013. (AP Photo/Christophe Ena) ( Cycling Tour de France )

TOURS, FRANCE - JULY 12: Riders pass by the Hotel De Ville as they start stage thirteen of the 2013 Tour de France, a 173KM road stage from Tours to Saint-Amand-Montrond on July 12, 2013 in Tours, France. (Photo by Doug Pensinger/Getty Images) ( 173338115 )

The pack of riders cycles on its way during the 173 km thirteenth stage of the centenary Tour de France cycling race from Tours to Saint-Amand-Montrond July 12, 2013. REUTERS/Jean-Paul Pelissier ( CYCLING-TOUR/ )

The pack passes fields of wheat near Nouans-les-Fontaines during the thirteenth stage of the Tour de France cycling race over 173 kilometers (108.1 miles) with start in in Tours and finish in Saint-Amand-Montrond, western France, Friday July 12 2013. (AP Photo/Christophe Ena) ( Cycling Tour de France )

Spain's Alejandro Valverde rides during the 173 km thirteenth stage of the 100th edition of the Tour de France cycling race on July 12, 2013 between Tours and Saint-Amand-Montrond, central France. JOEL SAGET/AFP/Getty Images ( 521304912 )

Spain's Alberto Contador (C) rides during the 173 km thirteenth stage of the 100th edition of the Tour de France cycling race on July 12, 2013 between Tours and Saint-Amand-Montrond, central France. JEFF PACHOUD/AFP/Getty Images ( 521308244 )

SAINT-AMAND-MONTROND, FRANCE - JULY 12: The peloton passes through a village during stage thirteen of the 2013 Tour de France, a 173KM road stage from Tours to Saint-Amand-Montrond on July 12, 2013 in Saint-Amand-Montrond, France. (Photo by Bryn Lennon/Getty Images) ( 173353969 )

The pack of riders cycles on its way during the 173 km thirteenth stage of the centenary Tour de France cycling race from Tours to Saint-Amand-Montrond July 12, 2013. REUTERS/Jean-Paul Pelissier ( CYCLING-TOUR/ )

Belgium's Philippe Gilbert (front) rides during the 173 km thirteenth stage of the 100th edition of the Tour de France cycling race on July 12, 2013 between Tours and Saint-Amand-Montrond, central France. JOEL SAGET/AFP/Getty Images ( 521308776 )

Lars Boom of The Netherlands, in third position, pours water over his head as he rides in the pack during the thirteenth stage of the Tour de France cycling race over 173 kilometers (108.1 miles) with start in in Tours and finish in Saint-Amand-Montrond, western France, Friday July 12 2013. (AP Photo/Laurent Cipriani) ( Cycling Tour de France )

Team Saxo-Tinkoff with Spain's Alberto Contador in second position leads the breakaway taking over one minute on overall leader Christopher Froome of Britain during the thirteenth stage of the Tour de France cycling race over 173 kilometers (108.1 miles) with start in in Tours and finish in Saint-Amand-Montrond, western France, Friday July 12 2013. (AP Photo/Christophe Ena) ( Cycling Tour de France )

Spain's Alberto Contador, center, grimaces as he rides with his teammates during the thirteenth stage of the Tour de France cycling race over 173 kilometers (108.1 miles) with start in in Tours and finish in Saint-Amand-Montrond, western France, Friday July 12 2013. (AP Photo/Christophe Ena) ( APTOPIX Cycling Tour de France )

Team Belkin with Bauke Mollema of The Netherlands in fourth position, leads the breakaway group during the thirteenth stage of the Tour de France cycling race over 173 kilometers (108.1 miles) with start in in Tours and finish in Saint-Amand-Montrond, western France, Friday July 12 2013. (AP Photo/Christophe Ena) ( APTOPIX Cycling Tour de France )

Overall leader's yellow jersey Britain's Christopher Froome rides in the pack during the 173 km thirteenth stage of the 100th edition of the Tour de France cycling race on July 12, 2013 between Tours and Saint-Amand-Montrond, central France. JOEL SAGET/AFP/Getty Images ( 521308555 )

Mark Cavendish of Britain crosses the finish line to win the thirteenth stage of the Tour de France cycling race over 173 kilometers (108.1 miles) with start in in Tours and finish in Saint-Amand-Montrond, western France, Friday July 12 2013. (AP Photo/Laurent Rebours) ( APTOPIX Cycling Tour de France )