Chris Froome emerged unscathed from a treacherous 17th stage of the Tour de France yesterday, retaining his lead while Alberto Contador lost a lot of ground and Tejay van Garderen abandoned the race.

American Van Garderen, who was third overall at the start of the 161-km trek from Digne les Bains, pulled out because of sickness with the day’s laurels going to German rider Simon Geschke after a brave solo raid.

Spaniard Contador’s hopes of achieving a rare Giro d’Italia/Tour double suffered another major knock when he lost touch with the group of top guns after crashing in the dangerous descent from the col d’Allos.

The Tinkoff-Saxo rider lost over two minutes on Froome and Colombian Nairo Quintana, who finished together after the final ascent to Pra Loup, a 6.2-km climb at an average gradient of 6.5 per cent.

Froome leads Quintana, who attacked him several times in the climbs, by three minutes and 10 seconds and his Movistar team-mate Alejandro Valverde, of Spain, by 4:09.

Contador is now fifth overall 6:40 off the pace, six seconds behind Froome’s compatriot and team-mate Geraint Thomas.

In 1975, Frenchman Bernard Thevenet snatched the yellow jersey from the great Eddy Merckx in a stage finishing in Pra Loup, but Froome was not to be overthrown yesterday.

The Briton showed fine descending skills and his usual power in the climbs to stay in control on another searing hot day on the Tour.

Peter Sagan was again in the day’s breakaway as part of a group of 28 that also featured France’s Thibaut Pinot and American Andrew Talansky.

Geschke powered away from that leading group before the tough ascent to the Col d’Allos – at 2,250 metres the highest point of this year’s Tour.

Lagging two minutes behind, Pinot launched the chase and at the top of the Col d’Allos had halved the deficit.

But in the descent the Frenchman skidded off and crashed.

He quickly remounted but had cut his legs and only managed fourth behind Andrew Talansky and Colombian Rigoberto Uran respectively.

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