ANGOULEME (France), July 28: Spaniard Alberto Contador was poised to win the Tour de France after holding off his rivals for the overall lead in Saturday's time trial won by his Discovery Channel team mate Levi Leipheimer.

American Leipheimer clocked the best time of one hour, two minutes and 44 seconds in the 55.5-km time trial, the 19th and penultimate stage, from Cognac at an average speed of 53.082 kph.

Australian Cadel Evans of the Predictor Lotto team was second ahead of Russian Vladimir Karpets of the Caisse d'Epargne team. The 24-year-old Contador came fifth.

Evans retained second place 23 seconds behind Contador in the overall standings, eight seconds ahead of Leipheimer.

“I've done all I could,” said Evans.

“I lost 55 seconds in the ascent of the Col de Peyresourde, that is where I lost the Tour,” the Australian said of one of the climbs in the Pyrenees in Wednesday's 16th stage.

Contador, who received the visit on Saturday of seven-times Tour winner and former Discovery Channel rider Lance Armstrong, is set to become the first Spaniard to win the world's greatest race since Miguel Indurain's fifth victory in 1995.

He is also about to become the first mere climber to prevail on the roads of France since Italian Marco Pantani in 1998.

Contador benefited from Michael Rasmussen's dismissal by his Rabobank team on Thursday for lying about his training whereabouts. The Dane held the leader's yellow jersey at the time.

Pre-race favourite Alexander Vinokourov was also sent packing after testing positive for blood doping following his victory in the Albi time trial last weekend.—Reuters