In short:

Tadej Pogačar surged in the final 12km of stage 19 to claim a spectacular victory.

Pogačar's lead has extended to 7 minutes, 11 seconds over Remco Evenepoel.

What's next?

Saturday night's (AEST) stage 20 is set to be an epic event as the riders climb further into the Alps.

Tadej Pogačar launched a stunning solo attack from the foot of the iconic Alpe d'Huez to win the 19th stage of the Tour de France and extend his overall lead overnight.

Even by the four-time Tour champion's lofty standards, it was up there with his best wins as he was more than 3 minutes behind with 12km remaining.

Riding without a teammate for the last section, he caught Ecuadorian rider Richard Carapaz and Frenchman Lenny Martinez with 1.5km left and then surged ahead for his fifth stage win of this year's race and 26th overall.

"It's very cool to win up here," Pogačar said. "I'm super happy to take the win."

Martinez finished six seconds behind and Carapaz — who won the 18th stage with a brilliant breakaway win of his own — nine seconds back. American Sepp Kuss, who faded in the closing stages, was 1 minute, 14 seconds adrift.

With a lead of 7 minutes, 11 seconds over Remco Evenepoel in the overall standings, and two stages remaining, Pogačar is on the brink of joining Eddy Merckx, Miguel Indurain, Jacques Anquetil and Bernard Hinault as the only men to win five Tours.

Barring mishap or accident, the Slovenian star will be crowned when the race ends on Sunday on the Champs-Élysées in Paris.

Rated as an HC mountain pass, the hardest category in the race, Alpe d'Huez is arguably the most famed climb in cycling and has near-mythical status on the Tour. Swarms of fans, many camping overnight and carrying flags of several nations, screamed encouragement on each of the 21 hairpins.

"It was a crazy atmosphere on the whole climb," Pogačar said.

He kept his focus as the public got perilously close to his face and, at one stage, he had limited visibility due to smoke from flares being lit by spectators.

But as impressive as Pogačar's win was, it also came about because Carapaz, Kuss and Martinez did not work together properly to distance Pogačar when he was lower down.

"I had to fight against super good riders," Pogačar said. "But they were playing against each other a bit so it helped me to catch up."

Perhaps thinking he could benefit from others fading and get the stage win, Martinez kept sitting on Carapaz's wheel, which was very much to Carapaz's annoyance and meant the veteran had too much work to do alone.

He kept trying to accelerate while Martinez — 10 years his junior — did less work and a tired-looking Kuss generally sat back too much before drifting away.

With 900m left, Carapaz was showing phenomenal stamina to stay with Pogačar, but he was finally undone by a brutal acceleration and could not follow as the yellow jersey rolled past him.

Saturday's mammoth 171m Alpine stage could be epic.

It features three HC climbs — Col de la Croix de Fer, Col du Galibier and Col de Sarenne — and one Category 1 climb up Col du Télégraphe before a hilly finish to Alpe d'Huez.

Pogačar does not need to go for victory and can safely hang back and protect his lead.

But will he?

There are 66m of pure climbing, and that may be too much for him to resist.

"Tomorrow is the Queen stage of the Tour," Pogačar said. "[It] is the hardest day of the Tour. We'll follow our own plan, our own rhythm. We don't care about anything else."

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