If Vincenzo Nibali continues to show the form that he has on the opening 13 stages, he could well move more than five minutes clear of the field on Saturday. Is Alejandro Valverde interested in chasing Nibali or will be he be content to consolidate a podium finish in Paris? Will Richie Porte have recovered in time for tomorrow's gruelling test? Will Team Sky give their riders free reign to chase stage wins?

Join me from 11:00 BST on Saturday for live text commentary of stage 14 to find out. There will be live radio commentary from 15:00 BST. Thanks for all your texts and tweets today and see you back here tomorrow.

Stage 14 is a huge day in the Alps with two category one climbs sandwiching a the Hors Categorie Col d'Izoard, which reaches a height of 2,360m - the highest point on this year's Tour. The first man over the top will win the Souvenir Henri Desgrange, awarded in memory of the founder of the Tour de France.

Here's what Geraint Thomas had to say in his stage-by-stage guide: "This will be another hard day in the saddle and it could prove interesting because we go over 2,000m twice in one day and altitude affects different riders in different ways. We are right into the thick of the race now and there will be tired bodies. It's another day for the main contenders."

Image source, Tour de France

Richie Porte on his disastrous day in the Alps: "I don't think I dealt with the heat real well. It's a massive shame but we'll see what happens tomorrow. It's a shame, more for my team-mates who have been brilliant but if it happens to me it can happen to others."

Polkadot Jersey
Classification

So. Vincenzo Nibali is running away with this and he's about to make three appearances on the podium - the first as stage winner, the second as leader of the race to collect another yellow jersey and a third to get the polka dot jersey as the new leader of the King of the Mountains classification.

Joaquim Rodriguez will continue to wear the polka dot jersey on stage 14 though because he is in second place and Nibali can't wear two tops. Purtio started the day 17 points clear of Thomas Voeckler, he is now 17 behind Nibali.

Polkadot Jersey
Classification

1. Vincenzo Nibali (Ita/Astana) 70

2. Joaquim Rodriguez (Spa/Katusha) 53

3. Thibaut Pinot (Fra/FDJ) 41

4. Alejandro Valverde (Spa/Movistar) 40

5. Rafal Majka (Pol/Tinkoff - Saxo) 40

Yellow jersey
Classification

1. Vincenzo Nibali (Ita/Astana) 56hrs 44mins 03secs

2. Alejandro Valverde (Spa/Movistar) +3mins 37secs

3. Romain Bardet (Fra/AG2R) +4mins 24secs

4. Thibaut Pinot (Fra/FDJ) +4mins 40secs

5. Tejay van Garderen (US/BMC Racing) +5mins 19secs

6. Jean-Christophe Peraud (Fra/AG2R) +6mins 06secs

7. Bauke Mollema (Ned/Belkin) +6mins 17secs

8. Jurgen Van den Broeck (Bel/Lotto) +6mins 27secs

9. Rui Costa (Por/Lampre) +8mins 35secs

10. Leopold Koenig (Cze/NetApp Endura) +8mins 36secs

1. Vincenzo Nibali (Ita/Astana) 5hrs 12mins 29secs

2. Rafal Majka (Pol/Tinkoff - Saxo) +10secs

3. Leopold Koenig (Cze/NetApp Endura) +11secs

4. Alejandro Valverde (Spa/Movistar) +50secs

5. Thibaut Pinot (Fra/FDJ) +53secs

Richie Porte finishes almost nine minutes behind Nibali. He has Mikel Nieve and Geraint Thomas for company as he crosses the line. He mutters something, probably a thank you, to his team-mates. He is dropping out of the top 10.

A third stage win then for Nibali on this year's race and a dominant display it was too. I know he can only beat the men in front of him but I wonder how he would have fared against Chris Froome and Alberto Contador on that final ascent.

Yellow Jersey
Classification

Early timings suggest that Nibali's lead over the new man in second, Alejandro Valverde, is three minutes, 37 seconds, with Romain Bardet in third, at four minutes, 24 seconds.

Majka is second over the line, ahead of Konig. Valverde was fourth over the line, just in front of Pinot. Spaniard Valverde will move up to second overall, but he is 50 seconds further behind Nibali than when he started.

Rob Hayles
Former Great Britain cyclist on BBC Radio 5 live sports extra

"We expected today to be a day for the GC riders but we didn't expect them to lose so much time to Vincenzo Nibali. He is rubber-stamping his authority on this race. With the time Richie Porte has lost today it is over for Team Sky, there's no way back from this."

VINCENZO NIBALI WINS STAGE 13.

Yellow Jersey
Classification

He climbs out of his saddle as he goes into the final 500m, then sits back down and zips up his yellow jersey before taking his hands off his handlebars and raises them to the crowd.

Nibali goes under the Flamme Rouge. Just 1km remaining and the worst of the mountain is behind him as he powers towards the finish line.

John Pulman:, external This isn't the first time Porte has gone backwards on a climb. Can't be considered a GC man until he gets better in the hills.

The French fans on the roadside are imploring their man Thibaut Pinot to put in one more effort as he goes under the 2km to go banner. He is riding with Valverde and they are 350m behind Nibali - that equates to 46 seconds.

This is a terrific show of strength by the race leader, who has left Majka and Konig with around 3km remaining. Nibali doesn't even get out of his saddle. He just presses a little harder on his pedals and suddenly he is 10 seconds clear.

Valverde is now 44 seconds back, Porte more than six minutes. Tour over?

There are lots of British flags on the mountainside, presumably fans who planned a long time ago to head out there to hopefully cheer on Chris Froome. They've got a long wait for Geraint Thomas and Simon Yates - the two Brits left in the race.

And Nibali goes again.

Rob Hayles
Former Great Britain cyclist on BBC Radio 5 live sports extra

"This is a sign that Richie Porte is having a bad day. This is not to do with his form. He is just having a bad day in the heat."