Tao Geoghegan Hart became only the second British man to win the Giro dâ€™Italia as he took the title in Milan.
The 25-year-old, who won stage 20 on Saturday, was tied with Australian Jai Hindley before the final stage, the first such instance in the raceâ€™s history.
But Ineos Grenadiersâ€™ Geoghegan Hart finished 39 seconds ahead of Hindley in the 15.7km time trial.
Chris Froome is the only other British man to win the Giro, in 2018.
Geoghegan Hart became the fifth British man - alongside Froome, Bradley Wiggins, Geraint Thomas and Simon Yates - to win a Grand Tour.
In only his fourth Grand Tour, Geoghegan Hart began the race as one of Geraint Thomasâ€™ domestiques and was in 126th place after the opening stage.
Geoghegan Hart described his victory as “bizarre”, adding: “Not in my wildest dreams did I imagine this would be possible when we started almost a month ago in Sicily.
“All of my career Iâ€™ve dreamed of trying to be top 10 - top five maybe - in a race of this stature, so this is something completely and utterly different to that and itâ€™s going to take a long time to sink in.
“My DS (director sportif) told me I was 10 seconds up and then he kept giving me a few seconds. I only knew we must be in a pretty good situation when they were screaming not to take any risks in the last kilometre.
“Itâ€™s not often your DS tells you to slow down that much in a 15k TT but I also knew the work was done up to that point so itâ€™s incredible to arrive here.”
More to follow.