A late mechanical forces Egan Bernal to walk home to the finish line. Afterward, he gets a little lift from his teammate Chris Froome.
Egan Bernal takes yellow jersey, surviving 50km attack from countryman Quintana.
The 21-year-old Team Sky rider will take on the Giro d'Italia in May.
Chris Froome opts out of defending Giro title in bid to win fifth Tour de France, opening door for 21-year-old Bernal to lead Team Sky in Italy.
Egan Bernal, 21, is under contract at Sky through 2023, but the team's sponsor woes could force him to look elsewhere next year.
The latest climbing talent to come out of Colombia, Egan Bernal has already established himself on cycling's biggest stage.
Bernal's brilliant ride at the Tour didn't come easily. Yet crashes, injuries, and an unexpected schedule change couldn't hold him back.