The new GC has Aru just three seconds down on Dumoulin but Rodriguez not yet out of it, trailing the Giant-Alpecin leader by 1:15. Quite spectacularly poised for the last few days of the race.
Burgos - Burgos
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Tom Dumoulin is the winner by a country mile - what a performance today.
Rodriguez comes home 3:06 down on Dumoulin to lose the red jersey.
Just a 1:53 loss for Fabio Aru, who improved remarkably over that final section - and he's still very much a factor in this race. He'll only be a few seconds down on the Dutchman on GC...
Majka looks like one of Ridley Scott's Aliens as he basking sharks his way to the finish line to lose the best part of three minutes to Dumoulin. That's 2.38 down on the stage winner.
Tom Dumoulin looks absolutely spent as he crosses the line to set a new best time of 46.01 - that's 1.04 better than Bodbar and will see the Dutchman back into the race lead.
Quintana takes fifth place, 29 seconds down on Bodnar.
Rodriguez was a massive 2:38 down on Dumoulin at the second check - his time in red will be short-lived.
Dumoulin has ripped up that climb and is now on a the tree-lined plateau ahead of the drop back down to the Burgos town centre. He'll be back in the red jersey soon.
Aru was a whole 1:44 down on Dumoulin at the second check... The Dutchman is now on the second climb and looking imperious.
Valverde comes home just four seconds down on Bodnar - that's an extraordinary ride from the Spanish veteran. Rumours that the wind direction has changed to help these later runners...
It's the best time for Dumoulin at the second split - by 38 seconds on Bodnar.
At the second check Valverde has set the third best time, 27 seconds down on Bodnar, and Quintana is the seventh at 50 seconds. But that's without the top seven riders, who are still to come.
Doumoulin is looking masterful out there, using his large 6'1" frame to devastating effect. Majka is 1:00 down at the first check and Rodriguez 1:11.
Aru has already shipped 44 seconds to Dumoulin at the first split!
Dumoulin goes through the first time check at the top of the first climb to set the best time so far - nine seconds ahead of Oliveira. How will the other's fare?
There are a couple of hills in this ITT course including one which averages 7% - so it's not one for the pure specialists, it's worth adding. That said, the way Dumoulin has been climbing this month...
Oliveira, the Portuguese time trial champion who won stage 13 last week, dropped to fifth place at the second check and then fourth place at the finish, 34 seconds behind Bodnar.
Valverde goes through the first time check in 18.12 - that's 19 second slower than the fastest man at that check, Portugal's Nelson Oliveira of Lampre-Merida.
We have time checks at 13.5km and 27.5km before the finish.
This morning Rodriguez told lavuelta.com: "The reality is that it is already a tough TT and we're up against one of the best time trial riders in the world. It is clear that Dumoulin is the favourite for this time trial. We will see how he has recuperated and it is the first time that he is in this situation where he has a big opportunity (to win a Grand Tour). It will not be easy to manage this situation."
Last but not least... Joaquim Rodriguez (Katusha) rolls down the ramp in a red skin suit with yellow boots. The veteran Spaniard lost the Giro d'Italia in 2012 when Ryder Hesjedal beat him in the ITT on the final day - he'll need to move on from that if he wants to win his first ever Grand Tour this coming weekend.
Fabio Aru (Astana) is all smiles as he preps himself on the ramp. The Italian lost the race lead on Monday and is currently wearing the white combined jersey - although he trails Rodriguez in the competition.
Rafal Majka is not a bad time triallist and he could consolidate his position in the podium, perhaps even move into the red jersey today. He's one of three Poles in Tinkoff-Saxo's team - and it's his countryman Bodnar who still leads.
A few spots of rain falling but nothing too severe...
And here we go, it's Tom Dumoulin on the go - he's the hot favourite, but can the Giant-Alpecin man deliver?
We're onto the top five now as Spaniard Mikel Nieve rolls down the ramp. Nieve is Sky's main man following the withdrawal of team-mate Chris Froome - and a top five finish would be a great comeback for the British team.
Esteban Chaves (Orica-GreenEdge) is the next man up. He's in the green jersey today although trails Rodriguez in the points competition by 10 points. The pint-sized Colombian won two stages in the opening week and wore the red for a decent stint too.
Dani Moreno (Katusha) is on the course now. The Spaniard has had a solid if unspectacular Vuelta riding in support of team-mate Rodriguez. A top ten finish would be quite a coup, mind.
Now it's another Movistar rider to have disappointed - Nairo Quintana, the runner-up of the Tour who has struggled with form and illness in Spain. He crashed in last year's time trial when in red, losing the jersey one day before he crashed out of the race with a broken collar bone.
South African youngster Louis Meintjes (MTN-Qhubeka) gets his effort under way. He's joining Lampre-Merida next season and will look to consolidate his position in the top ten.
Valverde rolls down the ramp to herald the arrival of the top ten. Bar his opening week stage win, the Spanish veteran has been disappointing in this Vuelta - perhaps because of his Tour exertions, perhaps because of his crash in the second week, most likely a coombination of the two.
Jerome Coppel (IAM) has just moved into third place at trhe expense of Cummings, the Frenchman trailing Bodnar by 28 seconds.
We pick up the stage live now and Poland's Maciej Bodnar (Tinkoff-Saxo) leads with a target time of 47.05 at the finish. Team Sky's Vasil Kiryienka is second at 27 seconds and Britain's Steve Cummings (MTN-Qhubeka) is third at 36 seconds.
Dutchman Tom Dumoulin (Giant-Alpecin) has been limiting his losses in the mountains to devastating effect. He's within 1:51 of the race summit and given his time trial specialist status many have tipped the 24-year-old to move back into the red jersey today. The former Dutch national time trial champion took the bronze medal in the ITT world championships last year and there's no doubting his superiority in the discipline. But can he take back the best part of two minutes - plus the extra time he'll maybe lose in the hills before Madrid?
The top ten on GC - starting with Alejandro Valverde (Movistar) - will get going at 16:31 CET time. Joaquim Rodriguez (Katusha) will be the last rider to leave at 16:49.
Boy van Poppel (Trek Factory Racing) was the first of 167 riders to roll down the ramp today. The riders leave at one-minute intervals until the final 28, who have two minutes separating them.
A reminder of the standings: Rodriguez leads Aru by one second with Rafal Majka third at 1:35, Tom Dumoulin at 1:55 and Mikel Nieve at 2:32.
Before the rest day Joaquim Rodriguez moved into the race lead by two seconds after dropping Fabio Aru on the final uphill finish of the race as Trek's Frank Schleck rolled back the years with a magnificent solo win.
Hello and welcome to live coverage of stage 17 of the Vuelta a Espana - the all-important 38.7km time trial in Burgos.