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Stage winner Vincenzo Nibali of Italy, wearing the overall leader's yellow jersey, climbs towards Hautacam after breaking away from his rivals during the eighteenth stage of the Tour de France cycling race over 145.5 kilometers (90.4 miles) with start in Pau and finish in Hautacam, Pyrenees region, France, Thursday, July 24, 2014. (AP Photo/Christophe Ena) ( APTOPIX Cycling Tour de France )

Stage winner Vincenzo Nibali of Italy climbs towards Hautacam after breaking away from his rivals during the eighteenth stage of the Tour de France cycling race over 145.5 kilometers (90.4 miles) with start in Pau and finish in Hautacam, Pyrenees region, France, Thursday, July 24, 2014. (AP Photo/Christophe Ena) ( Cycling Tour de France )

(R-L) Thibaut Pinot of France and FDJ.fr defends the Best young rider's white jersey as he leads the group with Tejay van Garderen of the United States and the BMC Racing Team and Rafal Majka of Poland and Tinkoff-Saxo who defended the king of the mountins polka dot jersey on the climb to the finish of the eighteenth stage of the 2014 Tour de France, a 146km stage between Pau and Hautacam, on July 24, 2014 in Hautacam, France. (Photo by Doug Pensinger/Getty Images) ( 452609168 )

Astana Pro Team leads the peloton on the climb of the Col du Tourmalet as the defend the overall race leader's jersey for Vincenzo Nibali of Italy and the Astana Pro Team during the eighteenth stage of the 2014 Tour de France, a 146km stage between Pau and Hautacam, on July 24, 2014 in La Mongie, France. (Photo by Doug Pensinger/Getty Images) ( 452610050 )

Vincenzo Nibali of Italy and the Astana Pro Team defends the overall race leader's yellow jersey as he and his teammates lead the group into the clouds on the climb of the Col du Tourmalet during the eighteenth stage of the 2014 Tour de France, a 146km stage between Pau and Hautacam, on July 24, 2014 in La Mongie, France. (Photo by Doug Pensinger/Getty Images) ( 452610072 )

Vincenzo Nibali of Italy and the Astana Pro Team defends the overall race leader's yellow jersey as he and his teammates lead the group into the clouds on the climb of the Col du Tourmalet during the eighteenth stage of the 2014 Tour de France, a 146km stage between Pau and Hautacam, on July 24, 2014 in La Mongie, France. (Photo by Doug Pensinger/Getty Images) ( 452610104 )

Vincenzo Nibali of Italy and the Astana Pro Team defends the overall race leader's yellow jersey as he and his teammates lead the group on the climb of the Col du Tourmalet during the eighteenth stage of the 2014 Tour de France, a 146km stage between Pau and Hautacam, on July 24, 2014 in La Mongie, France. (Photo by Doug Pensinger/Getty Images) ( 452610124 )

The peloton begins to race at the start of the eighteenth stage of the 2014 Tour de France, a 146km stage between Pau and Hautacam, on July 24, 2014 in Pau, France. (Photo by Doug Pensinger/Getty Images) ( 452610472 )

The peloton passes through the street of Pau as they begin the eighteenth stage of the 2014 Tour de France, a 146km stage between Pau and Hautacam, on July 24, 2014 in Pau, France. (Photo by Doug Pensinger/Getty Images) ( 452610658 )

The peloton passes through the street of Pau as they begin the eighteenth stage of the 2014 Tour de France, a 146km stage between Pau and Hautacam, on July 24, 2014 in Pau, France. (Photo by Doug Pensinger/Getty Images) ( 452610696 )

The pack with Italy's Vincenzo Nibali, wearing the overall leader's yellow jersey, climbs Tourmalet pass in the mist during the eighteenth stage of the Tour de France cycling race over 145.5 kilometers (90.4 miles) with start in Pau and finish in Hautacam, Pyrenees region, France, Thursday, July 24, 2014. (AP Photo/Laurent Cipriani) ( Cycling Tour de France )

France's Jean-Christophe Peraud, front, speeds down Tourmalet pass during the eighteenth stage of the Tour de France cycling race over 145.5 kilometers (90.4 miles) with start in Pau and finish in Hautacam, Pyrenees region, France, Thursday, July 24, 2014. (AP Photo/Christophe Ena) ( Cycling Tour de France )

The breakaway group passes a bull wearing the colors of the best climber's polka dotted jersey during the eighteenth stage of the Tour de France cycling race over 145.5 kilometers (90.4 miles) with start in Pau and finish in Hautacam, Pyrenees region, France, Thursday, July 24, 2014. (AP Photo/Christophe Ena) ( APTOPIX Cycling Tour de France )

A spectator films the pack as it passes during the eighteenth stage of the Tour de France cycling race over 145.5 kilometers (90.4 miles) with start in Pau and finish in Hautacam, Pyrenees region, France, Thursday, July 24, 2014. (AP Photo/Laurent Cipriani) ( Cycling Tour de France )

(From L) France's Florian Guillou, France's Sylvain Chavanel, and France's Matthieu Ladagnous ride in a breakaway during the 145.5 km eighteenth stage of the 101st edition of the Tour de France cycling race on July 24, 2014 between Pau and Hautacam, southwestern France. AFP PHOTO / JEFF PACHOUD/AFP/Getty Images ( 531887798 )

(From R) Italy's Alessandro De Marchi, France's Matthieu Ladagnous (hidden), France's Bryan Coquard and Italy's Marco Marcato lead a breakaway during the 145.5 km eighteenth stage of the 101st edition of the Tour de France cycling race on July 24, 2014 between Pau and Hautacam, southwestern France. AFP PHOTO / JEFF PACHOUD/AFP/Getty Images ( 531888058 )

(From R) France's Kevin Reza, Switzerland's Marcel Wyss, France's Matthieu Ladagnous and Netherland's Lars Boom lead a breakaway riding past a supporter holding a French national flag during the 145.5 km eighteenth stage of the 101st edition of the Tour de France cycling race on July 24, 2014 between Pau and Hautacam, southwestern France. AFP PHOTO / JEFF PACHOUD/AFP/Getty Images ( 531888595 )

(From R) Italy's Daniel Oss and Netherland's Lars Boom lead a breakaway during the 145.5 km eighteenth stage of the 101st edition of the Tour de France cycling race on July 24, 2014 between Pau and Hautacam, southwestern France. AFP PHOTO / JEFF PACHOUD/AFP/Getty Images ( 531888614 )

France's Jean-Christophe Peraud (C) rides in a breakaway during the 145.5 km eighteenth stage of the 101st edition of the Tour de France cycling race on July 24, 2014 between Pau and Hautacam, southwestern France. AFP PHOTO / LIONEL BONAVENTURE/AFP/Getty Images ( 531891884 )

Italy's Vincenzo Nibali wearing the overall leader's yellow jersey rides in a breakaway during the 145.5 km eighteenth stage of the 101st edition of the Tour de France cycling race on July 24, 2014 between Pau and Hautacam, southwestern France. AFP PHOTO / LIONEL BONAVENTURE/AFP/Getty Images ( 531891977 )

Italy's Vincenzo Nibali wearing the overall leader's yellow jersey rides in a breakaway as supporters cheer during the 145.5 km eighteenth stage of the 101st edition of the Tour de France cycling race on July 24, 2014 between Pau and Hautacam, southwestern France. AFP PHOTO / JEFF PACHOUD/AFP/Getty Images ( 531892060 )

Italy's Vincenzo Nibali wearing the overall leader's yellow jersey rides in a breakaway during the 145.5 km eighteenth stage of the 101st edition of the Tour de France cycling race on July 24, 2014 between Pau and Hautacam, southwestern France. AFP PHOTO / LIONEL BONAVENTURE/AFP/Getty Images ( 531892573 )

Italy's Vincenzo Nibali wearing the overall leader's yellow jersey rides in the pack during the 145.5 km eighteenth stage of the 101st edition of the Tour de France cycling race on July 24, 2014 between Pau and Hautacam, southwestern France. AFP PHOTO / LIONEL BONAVENTURE/AFP/Getty Images ( 531892799 )

Spectators cheer as Spain's Mikel Nieve Iturralde passes in the breakaway during the eighteenth stage of the Tour de France cycling race over 145.5 kilometers (90.4 miles) with start in Pau and finish in Hautacam, Pyrenees region, France, Thursday, July 24, 2014. (AP Photo/Christophe Ena) ( Cycling Tour de France )

Netherlands' Lars Boom, right, breaks away from the pack when climbing Tourmalet pass during the eighteenth stage of the Tour de France cycling race over 145.5 kilometers (90.4 miles) with start in Pau and finish in Hautacam, Pyrenees region, France, Thursday, July 24, 2014. (AP Photo/Laurent Cipriani) ( Cycling Tour de France )

France's Thibaut Pinot, wearing the overall leader's yellow jersey, Poland's Rafal Majka, wearing the best climber's dotted jersey, Italy's Vincenzo Nibali, wearing the overall leader's yellow jersey, and France's Brice Feillu, from left, climb Tourmalet pass in the mist during the eighteenth stage of the Tour de France cycling race over 145.5 kilometers (90.4 miles) with start in Pau and finish in Hautacam, Pyrenees region, France, Thursday, July 24, 2014. (AP Photo/Laurent Cipriani) ( APTOPIX Cycling Tour de France )

Poland's Rafal Majka, wearing the best climber's dotted jersey, crosses the finish line of the eighteenth stage of the Tour de France cycling race over 145.5 kilometers (90.4 miles) with start in Pau and finish in Hautacam, Pyrenees region, France, Thursday, July 24, 2014. (AP Photo/Laurent Cipriani) ( Cycling Tour de France )

Vincenzo Nibali of Italy and Astana Pro Cycling celebrates winning the eighteenth stage of the 2014 Tour de France, a 146km stage between Pau and Hautacam, on July 24, 2014 in Hautacam, France. (Photo by Bryn Lennon/Getty Images) ( 452611284 )

Rafal Majka of Poland and Tinkoff-Saxo retained his polka dot King of the Mountains Jersey after the eighteenth stage of the 2014 Tour de France, a 146km stage between Pau and Hautacam, on July 24, 2014 in Hautacam, France. (Photo by Bryn Lennon/Getty Images) ( 452611476 )

Vincenzo Nibali of Italy and Astana Pro Cycling celebrates winning the eighteenth stage of the 2014 Tour de France, a 146km stage between Pau and Hautacam, on July 24, 2014 in Hautacam, France. (Photo by Bryn Lennon/Getty Images) ( 452610956 )