Pogačar was on a hot pace from the start of the Stage 20 time trial, posting good times on the flatter sections of the course, before surging away on the Planche des Belles Filles to completely dominate both the stage and the general standings.
His performance saw him post a time of 55 minutes and 55 seconds, winning the stage by a minute and 21 seconds and moving to the top of the general classification with a 59-second lead over his fellow Slovenian, with Australian Richie Porte (Trek-Segafredo) completing the top three overall after a strong time trial saw him leapfrog Miguel Ángel López into third.