Hello and welcome to live coverage of stage 20 of the Tour de France - the all-important 22.5km individual time trial in Marseille, where the destiny of the yellow jersey will finally be decided...

Heartbreak for Michal Kwiatkowski! He crosses the line just over one second down on his Polish countryman, Maciej Bodnar, who stays in the lead.

Primoz Roglic (LottoNL-Jumbo) rolls down the ramp to get his ITT under way. The Slovenian is a time trial specialist but also showcased his climbing ability to win in Serre Chevalier in stage 17 after taming the mighty Col du Galibier. His opening TT in Dusseldorf was derailed by a crash in the rain - like half his team, it seemed - but today the sun is out, and Roglic will be one of the favourites to stand atop the podium in the Stade Velodrome.

There's your answer: Kwiatkowski is still in the lead at the second check, but his gap has come down to just one slender second after that climb.

Kwiatkowski is onto the climb so it's the moment of truth for the Pole...

Kwiatkowski is on a stormer! The Pole leapfrogs his compatriot Bodnar at the first check, setting a new target time at the 10.2km check of 11'53" - six seconds quicker than Bodnar. The Team Sky rider is lighter and has been climbing very well in support of Froome, and so he should - in theory - get up to Notre Dame much quicker than Bodnar.

It's the fourth best time for Stefan Kung, 34 seconds down on Bodnar at the finish. Interestingly, Team Sunweb's Nikias Arndt - the German who was outfoxed by Edvald Boasson Hagen yesterday - has set the third best time, 28 seconds down.

Huge cheers for Thomas Voeckler, who comes home to finish his last ever time trial on the Tour de France. The former French housewives' favourite - riding his 15th Tour aged 38 - retires at the end of this season. And he's not going to reappear on the podium: the Direct Energie rider sets the clock a hige 3'40 down on our leader, Bodnar. So, Thomas won't set tongues wagging tonight...

It will be interesting to see how Michal Kwiatkowski goes today - many have tipped the Team Sky rider to be among the favourites today. The Pole has been one of the riders of this year's Tour - working tirelessly for his leader, Chris Froome. Can he ride for himself today and show what he's capable of?

Stefen Kung was 10 seconds down at the first check and then 30 seconds down at the second check atop the climb, so it's looking like the Swiss won't challenge the top times today. It's been a shocker of a Tour for BMC who lost their GC rider Richie Porte to a crash in stage 9 and didn't see Greg van Avermaet pick up any wins. The Olympic road race champion has just started his ITT, incidentally.

CRASH: Just 20 seconds into his effort and Jonathan Castroviejo of Movistar skids out on the first bend outside the stadium - and the Spaniard needs to change a bike. He's already made it hard for him to be a factor today...

The Stade Velodrome is called such because it used to house a velodrome which, up until 1967, hosted 10 stage finishes of the Tour de France, as well as regular track events. The last time the velodrome was used for a cycling event was in 1972 for the world championships. The track then fell into disuse and in 1986 Bernard Tapie, the manager of l'OM pulled it up and replaced it with seating for the football stadium, which nevertheless kept the name of the Stade Velodrome as a reminder of its heritage.

It's good, but it's not good enough for Tony Martin: the world champion comes home 14 seconds down on Bodnar, who is in a good position to win this stage now - unless Chris Froome is feeling in good nick.

Stefan Kung, the young Swiss who finished second - behind Geraint Thomas - in the opening time trial, is on the course now, around seven minutes into his ride. The BMC man will be one of the favourites today.

Tony Martin came through the first check one second down on Bodnar. On the climb he stayed in the drops on those tri bars as he slow-motion steam-rollered past Daniele Bennati and Zdenek Stybar, a cascade of spittle and sweat pouring down his face and off his chin. But despite his obvious effort, the German was 14 seconds down on Bodnar at the 15.6km check and so he may struggle to make up the time on the Pole over the final quarter of the course.

Vasil Kiryienka is a former TT world champion but the Team Sky rider is clearly rather zonked after three weeks of working for Chris Froome: the Belarus veteran comes home 1'07 down on Bodnar's target time. Sutterlin then comes over a bit later 42 seconds down.

Could that be the winning time? Maciej Bodnar has come home to finish over a minute quicker than Taylor Phinney! Could there be life at Bora-Hansgrohe after Peter Sagan after all? The Pole's time of 28'15" won't be beaten for quite some time... unless Tony Martin is on a stormer!

Wow - Bodnar has smashed Phinney's time atop the climb of Notre-Dame de la Garde: the Pole comes through the second intermediate check in a time of 20'22 which is 51 seconds quicker than Phinney.

In fact, Phinney is now only the fifth fastest at the first intermediate check: Bodnar, Sutterlin, Kiryienka and Bak are all quicker after 10.2km. It's the Pole from Bora-Hansgrohe Maciej Bodnar whose time of 11'59 is the reference, 15 seconds quicker than Jasha Sutterlin of Movistar, with Phinney now 27 seconds back.

World champion Tony Martin is on course - so we will soon see just how good those reference times set by Phinney are...

Some stats on our current leader, Taylor Phinney.

World TT champion Tony Martin will be rolling down the ramp in seven minutes: the German from Katusha-Alpecin will be one of the favourites to win today, along with the likes of Chris Froome and Primoz Roglic...