VAL THORENS – Egan Bernal was poised to become the first Colombian to win the Tour de France when he retained the overall lead after Saturday's 20th stage, a 59-km ride from Albertville.
The Team Ineos rider, 22, finished the stage won by 2014 champion Vicenzo Nibali of Italy in fourth place.
His team mate and defending champion Geraint Thomas is second overall ahead of Dutchman Steven Kruijswijk after France's Julian Alaphilippe cracked in the final ascent to the ski resort of Val Thorens.
Sunday's final stage from Rambouillet to Paris is a largely processional ride with only the final sprint being contested.
Bernal, who claimed the yellow jersey when he was the first at top of the Col de l'Iseran in Saturday's truncated 19th stage, was never bothered in a stage that had been shortened due to landslides on the initial course.