Geraint Thomas is going to Paris in the yellow jersey.
No longer merely a support rider for Chris Froome, the Welshman with Team Sky effectively sealed his first Tour de France title by protecting his lead in the time trial on the penultimate stage on Saturday.
Thomas takes an advantage of 1 minute 51 seconds over Tom Dumoulin into the mostly ceremonial finish on the Champs-Elysees on Sunday.
"It's just overwhelming," Thomas said. "I didn't think about it all race and now suddenly I won the Tour."
Dumoulin won the 20th stage by one second from four-time champion Froome, who leapfrogged Primoz Roglic into third place overall.
It was Dumoulin's second career stage win in the Tour, having also won a time trial in 2016.
Thomas finished third in the stage, 14 seconds behind.
That was more than enough with an advantage of more than two minutes at the start of the day.
"The strongest guy has won this Tour de France," Froome said.
"Tomorrow, to stand up on the podium with G, it's going to be a really proud moment for me."
Thomas, known as "G," was a support rider during Froome's title rides but he became Sky's undisputed leader when Froome cracked in the grueling 17th stage through the Pyrenees.
Wearing an all-yellow skin suit on a bike in the red, white and blue colors of the British flag, Thomas was the last rider to start the time- trial and was fastest at two checkpoints before slowing in the final kilometres.
At the finish, Thomas let out a loud scream and held his arms out wide in celebration. He embraced his wife, Sara Elen, as soon as he got off his bike.
The last time I cried was when I got married Geraint Thomas
"The last time I cried was when I got married," Thomas said as he teared up.
Thomas is poised to become the third British rider - and first from Wales - to win the Tour after Bradley Wiggins and Froome.
He will make it Sky's sixth victory in the last seven years.
Thomas claimed the yellow jersey by winning Stage 11 in the Alps, followed that up with another victory atop Alpe d'Huez a day later, and defended his advantage through the Pyrenees.
"He was in the shape of his life," Dumoulin said.
"He didn't make any mistakes. He was never put into trouble by anyone, in the mountains or anywhere - including by myself."
Australia's Michael Hepburn (Mitchelton-Scott) delivered a strong ride to finish 10th after laying down an early marker of 42:15.
