The Tour De France

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Stage winner Christopher Froome of Britain, wearing the overall leader's yellow jersey, strains in the last meters of the seventeenth stage of the Tour de France cycling race an individual time trial over 32 kilometers (20 miles) with start in Embrun and finish in Chorges, France, Wednesday July 17, 2013. (AP Photo/Laurent Rebours)

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Christopher Froome of Britain, wearing the overall leader's yellow jersey, and Spain's Alberto Contador, right, speed down manse pass in the last kilometers of the sixteenth stage of the Tour de France cycling race over 168 kilometers (105 miles) with start in in Vaison-la-Romaine and finish in Gap, France, Tuesday July 16, 2013. (AP Photo/Laurent Cipriani)

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Rui Alberto Costa of Portugal celebrates as he crosses the finish line to win the sixteenth stage of the Tour de France cycling race over 168 kilometers (105 miles) with start in in Vaison-la-Romaine and finish in Gap, France, Tuesday July 16, 2013. (AP Photo/Laurent Rebours)

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Matteo Trentin of Italy celebrates as he crosses the finish line to win the fourteenth stage of the Tour de France cycling race over 191 kilometers (119.4 miles) with start in in Saint-Pourcain-sur-Sioule and finish in Lyon, central France, Saturday July 13 2013. (AP Photo/Laurent Rebours)

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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)

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Stage winner Marcel Kittel of Germany grimaces after crossing the finish line of the twelfth stage of the Tour de France cycling race over 218 kilometers (136.2 miles) with start in in Fougeres and finish in Tours, western France, Thursday July 11 2013. (AP Photo/Laurent Rebours)

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Overall leader Christopher Froome of Britain prepares to leave for a training ride with his teammates on the rest day of the Tour de France cycling race in La Baule, western France, Monday July 8 2013. (AP Photo/Laurent Cipriani)

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Dan Martin of Ireland crosses the finish line ahead of Jakob Fuglsang of Denmark to win the ninth stage of the Tour de France cycling race over 168.5 kilometers (105.3 miles) with start in Saint-Girons and finish in Bagneres-de-Bigorre, Pyrenees region, France, Sunday July 7 2013. (AP Photo/Christophe Ena)

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A fan waves a British flag as new overall leader Christopher Froome of Britain sprints towards the finish line to win the eight stage of the Tour de France cycling race over 195 kilometers (122 miles) with start in Castres and finish in Ax 3 Domaines, Pyrenees region, France, Saturday July 6 2013. (AP Photo/Laurent Cipriani)

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Daryl Impey of South Africa, wearing the overall leader's yellow jersey, kisses his wife Alexandra before the start of the seventh stage of the Tour de France cycling race over 205.5 kilometers (128.5 miles) with start in Montpellier and finish in Albi, southern France, Friday July 5, 2013. (AP Photo/Christophe Ena)