SAINT EMILION, France, July 17 (Reuters) - Slovenian Tadej Pogacar was poised to win a second consecutive Tour de France title after the Slovenian retained the overall leader"s yellow in the 20th stage, a 30.8-km individual time trial won by Belgian Wout van Aert on Saturday. Barring a crash in Sunday"s final stage in Paris, the 22-year-old Pogacar will finish ahead of Dane Jonas Vingegaard and Ecuador"s Richard Carapaz, who are set to end up second and third overall, respectively.