That barn-storming ride means Dumoulin is the new race leader with an advantage of 2:23 over Nairo Quintana (Movistar) and 2:38 over compatriot Bauke Mollema (Trek-Segafredo).
Foligno - Montefalco
Giro d'Italia - 16 May 2017
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Victory for Tom Dumoulin (Team Sunweb), who wins this time trial by 49 seconds over Geraint Thomas of Team Sky.
Nairo Quintana manages to stay upright on the technical approach to the finish - and he comes home in 23rd place, 2:53 down on the winner Tom Dumoulin.
Here's Thibaut Pinot, the French national champion. We expected better from him today - and he's still in this race on the grounds of his climbing skills - but his time is only good enough for 19th, 2:42 down. That won't be much better than Quintana...
Quintana still has 3km left to ride - including that climb into Montefalco - while Pinot, who we haven't seen for a while, must be approaching the final kilometre or so now.
Dumoulin looks absolutely spent... and so he should after that huge effort. The win and maglia rosa are his - we just need to cross the Ts and dot the Is.
Just two more riders to arrive now: Pinot and Quintana...
And here's Tom Dumoulin, who is going to smash this to smithereens... the Team Sunweb rider comes home 49 seconds faster than Thomas to win the stage and seize the pink jersey from Quintana's shoulders.
Here comes Bauke Mollema and he's going to be slower than Nibali... The Dutchman is 10th for now, 1:28 down on Thomas.
As it stands, Dumoulin has taken 2:35 off Quintana... and he still has one kilometre left to ride.
Nibali crests the top of the climb with 500m remaining - and he's already outside Thomas's time. He survives the corner where Kiryienka came a cropper, and then leaps out of the saddle as he drives to the line. He comes home for fifth place, 1:18 down on Thomas. That's not a bad recovery, all things considered. He should take time back on Quintana, at least.
It's 22nd place for Pozzovivo, 2:18 down on Thomas at the finish. He too, like Thomas, overcooked one of the final bends and almost slammed into the barriers.
Nibali has two kilometres remaining as he enters the outskirts of Montefalco on the newly tarmacked section of road that will be music to his ears.
Nairo Quintana is a huge 2:09 down on Dumoulin at the second check at Bastardo. He's going to perhaps lose three minutes today - time he will have to take back, and some, ahead of the final flat ITT into Milan.
Vincenzo Nibali has got stronger in this final third - he's recouping some lost time on the hilly segment into the headwind.
Ilnur Zakarin crosses the line 1:30 down on Thomas for provisional ninth place.
Bauke Mollema enters the final phase of his ride - and the Dutchman has been going admirably so far. He won't be anywhere near winning it, but he'll stay in contention with the other GC favourites.
Thibaut Pinot comes through the second check and he's a huge 1:42 down for the Frenchman - and he could well be out of the top three tonight.
Quintana is zipping down the descent ahead of the second intermediate check at Bastardo - he's rather wobbly and unsure on his wheels. Watching him and Dumoulin is like watching two very different sports today.
Tom Dumoulin is 36 seconds quicker than Geraint Thomas at the second check in Bastardo. He's really flying. It will take a crash or mechanical to derail this Dutch juggernaut.
Steven Kruisjwijk (LottoNL-Jumbo) crosses the line for provisional 14th place, a huge 1:54 down on the current leader Thomas.
Vincenzo Nibali is 1:02 down on Thomas's target time at the second intermediate check. He's not having a good ITT.
Tom Dumoulin went on holiday here a couple of years ago - and it's going to be a holiday atmosphere tonight when he's popping the champagne corks. He finds the time to have a quick snack, but he looks absolutely imperious on his TT steed and will win this by a huge slice of time - so much that he may be one or two minutes ahead of Quintana by tomorrow.
Shocker for Tejay Van Garderen, who comes home more than three minutes down in provisional 32nd place. That's his already shaky GC bid gone - and it's terrible for BMC, who have already lost Rohan Dennis to injury.
Now here comes Bob Jungels at the finish - and he won't beat Thomas... the Luxembourg champion is seven seconds down on the Welshman for the second best provisional time.
Quintana may be 48 seconds down, but it could have been far worse: he took the corner at the first check wide and was forced to bunny hop over a traffic divider... Great bike handling skills!
Davide Formolo is on his way to losing the white jersey: he's already more than two minutes down at the second check.
Nairo Quintana is already out of the maglia rosa! The Colombian rode through the first check a mammoth 48 seconds down on Tom Dumoulin...
So, Thomas may be in the lead for now, but Dumoulin was 20 seconds quicker at the first check, while that man Jungels is yet to finish. It's no done deal.
Pinot comes through the first intermediate check and he's a huge 29 seconds down... but that's skewed because the new best time there has moments earlier been set by Tom Dumoulin, a massive 18 seconds faster than Jungels.
What a way to turn things round: Geraint Thomas, his knees covered in scabs from that crash on Sunday, smashes Sanchez's time at the finish - coming home a huge 51 seconds quicker than the Spaniard, and all that despite overcooking one of the final bends and almost ending up the same way as Kiryienka. The Welshman's average speed out there was 46.429 km/h.
Yes, Thomas is back on the top at the second check with his time of 34:00 - which is three seconds faster than Jungels for now.
What a ride Bob Jungels is having: the Luxembourg national champion is said to have the best time at the second check - but it's given as 18 seconds faster than Kiryienka. But Thomas' time has disappeared - so if reinstated it would be the Welshman 3 seconds faster than Jungels. Watch this space...
There goes Nairo Quintana and everyone is now on the road. Can the little Colombian hold on? He leads Pinot by 28 seconds and Dumoulin by 30 seconds - and both those riders are expected to post fast times today, if not the fastest. It's going to be a big ask.
Nibali is 21 seconds down at the first time check - not a good time for the defending champion...
Tom Dumoulin zips through the chicane where Pavel Brutt earlier crashed (see video below). He's actually got a motorbike right in front of him - either dragging him along, or impeding his progress. That will have to get out of the way once the road straightens out...
And here's Pinot in the French national champions skin suit... He's also a good bet for the win should Dumoulin falter - although Thomas and Jungels are mighty impressive so far.
Pozzovivo is 30 seconds down at the first check and so it won't be the piano-playing Italian's day.
Next up is Thibaut Pinot of FDJ - and our roving reporters Ashley House and Roy Hayles took a look at the Frenchman's bike this morning in Foligno.
Dutchmen Bauke Mollena and Tom Dumoulin have both rolled down the ramp. The latter is the Dutch time trial champion and the big favourite today...
Like Kruijswijk, Zakarin is not going so well: he's 19 seconds down at the first check.
Geraint Thomas has set the fastest time at the second intermediate check - and it's a huge 21 seconds faster than his team-mate Kiryienka, and 41 seconds faster than the man who currently leads at the finish. What a ride he's having.
We're into the top five now and Bahrain Merida's Vincenzo Nibali, the defending champion, has just got his ITT under way. He trails Quintana by 1:10 on GC and needs a good ride today to reinvigorate his chances for pink.
Second best time for Andrey Amador of Movistar, who comes through the first check just one second down on Jungels. Impressive stuff.
Domenico Pozzovivo (Ag2R-La Mondiale) rolls down the ramp. Italy are still without a win in this year's Giro - and Pozzovivo won't help to change that today.
Here's Kruijswijk at the first check - and he's 20 seconds down on Jungels. He's not on a good ride...
Andrey Amador (Movistar), Davide Formolo (Cannondale-Drapac) and Ilnur Zakarin (Katusha-Alpecin) are all on course now... just the top six to leave.
Mikel Landa is really soft-pedalling this one. He negotiates the corner than did for his team-mate Kiryienka and then comes home 2:22 down on current leader, Luis Leon Sanchez. It will be a surprise to see Landa race on for much of this week - surely it makes sense for him to rest up and support Froome at the Tour.
Bob Jungels comes through the first intermediate check two seconds faster than Geraint Thomas. After so much dross, these times are getting competitive.
Steven Kruijswijk (LottoNL-Jumbo) is the first of the top 10 riders to roll down the ramp. The Dutchman needs a good day after suffering a bit on the climb to Blockhaus on Sunday.
Tanel Kangert of Astana is the latest rider down the ramp. His team-mate Luis Leon Sanchez is the current provisional leader at the finish. We're about to head into the top ten.
Adam Yates is going well, too. The Orica-Scott rider posts the third best time at the first check, 10 seconds down on Thomas and Kiryienka.
Storming ride by Thomas! The Welshman is into the lead at the first check - he's gone through level on time with Sky team-mate Vasil Kiryienka, who was earlier leading the whole thing despite that crash in the final 500m (see video below).
The riders are now leading at three minute intervals with Dario Cataldo (Astana), Tejav Van Garderen (BMC) and Bob Jungels (Quick-Step Floors) all on course.
We're onto the top 15 now as Jan Polanc of UAE Team Emirates rolls down the ramp in the blue skinsuit denoting his lead in the maglia azzurra KOM classification. Polanc won at Mount Etna and has 44 points to Quintana's 35 points following the Colombian's victory at Blockhaus.
Adam Yates (Orica-Scott) is also on course now. A couple of days ago things were so different: Thomas and Yates were 2nd and 3rd at six and 10 seconds respectively. They're now 17th and 16th at 5:14 and 4:49.
We have a new leader: Luis Leon Sanchez comes home without any hiccups and shaves 20 seconds off Vasil Kiryienka's previous leading time. The new time to beat is 52:17.
Off goes Geraint Thomas of Team Sky, who starts his bid to turn things round after that disastrous crash on Sunday. And if you didn't see it, here's a video of that incident with the motorcycle...
Rui Costa of Portugal is the latest rider to ping down the ramp - and he's in 18th place on GC.
Luis Leon Sanchez is on the final rise to Montefalco. He has just over 2km to go and he could well be riding into the provisional lead - provided he doesn't go down on that final bend like Kiryienka, the man who still leads today despite that tumble.
Another news of a crash: apparently Fernando Gaviria also hit the deck in the opening few kilometres today. He's in esteemed company, with the likes of Kiryienka and Brutt also going down. The Colombian double stage winner - who leads the maglia ciclamino points competition - remounted and finished his ITT without any problems, so that's a relief to hear. But it's yet more evidence that the big guns will have to balance their efforts today - or risk crashing out of contention.
Luis Leon Sanchez was 13 seconds down at the first check and then 20 seconds down on Kiryienka at the second check after 28.2km. That's enough for second place so far today - and remember that Kiryienka lost a lot of time near the finish with that crash, so the Spaniard is on course to beat him.
Before the favourites roll down the ramp, the big question remains whether or not Carlien agreed to go on a date with Campenaerts... Some have said the Belgian was being unprofessional by using today's time trial as a means of approaching a mystery girl. But then if his LottoNL-Jumbo team ordered one of the pre-stage favourites not to over-exert himself or target the win, then surely this is fair game?
No change at the top for now. The provisional top five are: 1. Kiryienka, 2. Tratnik +13, 3. Van Emden +15, 4. Hepburn +23, 5. Barta +36.
Down the ramp goes Mikel Landa of Team Sky, who lost 27 minutes after that crash with a motorcycle on Sunday. To think that he was only 10 seconds off the summit before stage 9...
Tobias Ludvigsson rolls down the ramp - and usually, the Swede would be a good bet to contest the win, but he, like Campenaerts, has been told to conserve his energy and work for his FDJ team-mate Thibaut Pinot over the next 10 days.
Occasional Eurosport commentator and full-time Twitter legend and GCN roving reporter, Daniel Lloyd has done the research and maths: his prediction is that Dumoulin will take 2.87 seconds on Quintana per kilometre, which equates to 114.226 seconds over this 39.8km course today. In other words: 1min 54sec. You heard it here - via Dan's Twitter feed - first.
CLOSE SHAVE: Boaro's back wheel skids on a coarse piece of tarmac in the latest thumbs-down to the quality of road surface in this neck of the Umbrian woods.
Here's an aerial view of the start in Foligno - and not a bad view, either.
Jos van Emden, who had set the third best time at the second check, 33 seconds down on leader Kiryienka, arrives at the finish to keep up that consistency: it's the third best time, 15 seconds down on Kiryienka.
Two potential winners today - Manuele Boaro (Bahrain Merida) and Luis Leon Sanchez (Astana) are both on course now, so it will be interesting to see how they fare at the first check point.
After visits to regions famed for Chianti, Prosecco and Barolo, this year's opening time trial continues the recent trend of celebrating Italy's most famous wines – in this case the Sagrantino secco that is the calling card for the area around Montefalco (which appears in the Giro for the first time). While there's more climbing than last year's opening Chianti time trial (won by Primoz Roglic), the slopes are not comparable to last year's second ITT on Alpe di Siusi. On paper, it's hard to look past Dutchman Tom Dumoulin (Team Sunweb) - especially after Kiryienka's fall - but the likes of Vincenzo Nibali (Bahrain Merida), Thibaut Pinot (FDJ), Tobias Ludvigsson (FDJ), Bob Jungels (Quick-Step Floors) and Steven Kruisjwijk (LottoNL-Jumbo) should also go well, Luis Leon Sanchez (Astana) too, not to forget Geraint Thomas of Team Sky.
This first of two major individual time trials in the Giro100 is a hilly test in Umbria over a challenging 39.8km course that pretty much ticks all boxes. The flat and straight opening 12km from Foligno to Bevagna may see the specialists build up a commanding lead. But the steady climb to Madonna delle Grazie and a twisting and technical descent will throw a cat among the pigeons for which Bevagna is renowned. The second intermediate checkpoint at Bastardo is followed by an uphill false flat and the final rise to the walled town of Montefalco, where a stinging ramp precedes the finish.
Tratnik came home to top Barta's best provisional time before Kiryienka, having remounted, crossed the line to move into the lead despite that crash. The Sky riders completed the 39.8km course in a time of 52:37 - 13 seconds quicker than Tratnik. But when you take into account that Tratnik started one minute ahead of Kiryienka, then that lead could have been much, much larger.
OH NO! Kiryienka has crashed! It looks odd when Jan Tratnik was spotted on the home straight before the Belarusian - and then the replays showed just why that was: Kiryienka lost his front wheel on a right-hand bend near the finish and crashed onto his shoulder and into the barriers. Team Sky's terrible luck continues...
NASTY CRASH: Russian veteran Pavel Brutt of Gazprom-Rusvelo skids out on a corner early on, and ends up among some metal construction rods and orange plastic fencing. That could have been far worse - those rods are usually very sharp; he could have impaled himself.
I mentioned Victor Campenaerts and his marriage proposal... well, here he is crossing the line. I wonder if Carlien said "yes"... Or will it depend on his time?
Slovenian national road champion Jan Tratnik of CCC Sprandi Polkowice, who started one minute before Kiryienka, is riding a fine line: he's just been passed by the Belarusian but is currently riding in his slipstream with around 4km left to ride.
So far, so good for Vasil Kiryienka of Team Sky, who passes through the second check in a time of 34:21 which shaves 31 seconds off Jan Barta's previous target time.
We spoke to Welshman Geraint Thomas on the rest day - and despite the huge setback in stage 9 to Blockhaus, the Team Sky rider remains confident that he can still make a splash in the 100th edition of the Giro, but appreciates that it won't be plain sailing.
Jos Van Emden of LottoNL-Jumbo comes through the first check 10 seconds down on Kiryienka for the new second best provisional time.
Traffic on the course: Kirienka has two riders in his sights and passes the first Bardiani one and closes in on the next. Meanwhile, a LottoNL-Jumbo rider - probably Campenaerts - catches a swerving Caleb Ewan and another rider at pretty much the same time. It's clear that many riders are really going through the motions out there and doing their best to take a second rest day.
The big story of Sunday's first major summit finish at Blockhaus was not Quintana's win but that terrible crash that involved most of the Team Sky riders, including their leaders Geraint Thomas and Mikel Landa. Where do the British team go from here? Watch our little video analysis here...
Meanwhile, Kiryienka is big-ringing the climb up to San Marco ahead of the second time check at Bastardo. It's a sunny day in Umbria after a huge thunderstorm yesterday in the area. It's a fairly clement 23 degrees Celsius, though, so not too sweltering out there for the riders.
The road surface today is pretty shoddy. Kiryienka had to just weave his way through a series of potholes, while Dutchman Martijn Keizer (LottoNL-Jumbo) hit a bump on an early roundabout and lost his water bottle - meaning he has to complete this test without any extra hydration.
One of the big favourites for today's ITT is Team Sky's Vasil Kiryienka, the Belarusian veteran who took the silver medal at least year's world champions. Kiryienka has passed through the first check at Bevagna in a new fastest time of 10:42 - that's 11 seconds quicker than Barta. He's clearly in it to win it today.
If you missed last week's action in the Giro then you can catch up on all the big stories and subplots in the rest day Blazin' Saddles blog - just click the link below...
We should also add that before Campanaerts started his time trial he unzipped his skinsuit to reveal a message reading "Carlien Daten" - which roughly translates as, "Carlien, will you marry me?". Perhaps her answer will depend on how he fares on the road today...
Jan Barta comes over the line to take the best provisional time of 53:13 - so that's 38 seconds faster than Bialoblocki.
It's worth noting that the riders are currently leaving at one-minute intervals until we get to the top 15. The big guns will be going at three-minute intervals later this afternoon - so the gaps between the riders will be much larger, and there will be less overtaking.
Just the three riders have completed this ITT so far with the current target time being set by Marcin Bialoblocki (CCC Sprandi Polkowice) at 53:51. But expect Barta to smash that time once he comes home.
It's also that man Barta who set the fastest time at the second check at 28.2km where he came through in 35:40 - a whole 48 seconds quicker than anyone else.
The current target time for the first intermediate sprint has been set by Jan Barta of Bora-Hansgrohe. The Czech came through the 9.8km check at Bevagna in a time of 10:53.
One of the big favourites for today would have been Victor Campenaerts of LottoNL-Jumbo but the Belgian is on domestique duty for team-mate Steven Kruijswijk and has been told not to overly exert himself today. The Belgian TT champion is currently on the road.
We have two intermediate time checks out there: at Bevagna after 9.8km and at Bastardo after 28.2km. For the sake of ease, we'll register them as at 10km and at 28km.
Matteo Pelucchi of Bora-Hansgrohe was the first rider to roll down the ramp. The Italian is currently last on GC - more than two hours (2:00:18 in fact) down on the race leader, Nairo Quintana.
Here are Brian 'The Coach' Smith's thoughts on today's ITT - and he reckons the wind will be a big factor...
It's a lumpy course through the Umbrian vineyards from Foligno to Montefalco which includes a couple of climbs but nothing too taxing - so expect someone with real chrono pedigree like Tom Dumoulin to run riot today.
On Sunday, before yesterday's rest day, Nairo Quintana blew the Giro d’Italia field away with a huge attack on the fearsome Blockhaus to win Stage 9 and move into the maglia rosa as Britain’s Geraint Thomas and Adam Yates saw their hopes dashes by a huge crash caused by a stationary police motorcycle.
Ciao and welcome to live coverage of stage 10 of the Giro d'Italia - a 39.8km individual time trial in the Sagrantino wine region of Umbria, and perhaps a chance for Tom Dumoulin to move into the maglia rosa at the expense of Nairo Quintana.