Hello and welcome to live coverage of the big one: it's double Stelvio day on the Giro d'Italia with the 222km queen stage 16 from Rovetta to Bormio - one that also includes the fearsome Mortirolo. Sit tight, buckle up, and join us for the ride...

So, after that wobble on the Umbrailpass, Tom Dumoulin retains his maglia rosa, but sees his lead slash to 31 seconds on Nairo Quintana, while stage 16 winner Vincenzo Nibali rises to third place at 1:12. Game on!

Confirmation of the top ten from an enthralling stage on the Giro...

Mikel Landa came so close to opening up Team Sky's account but was left ruing his luck as he slammed the handlebars twice after Nibali pickpocketed him over the line.

Brilliant by Tom Dumoulin, who comes home 2:18 down to retain the maglia rosa after his very big scare today.

Formolo must have broke clear on the descent because the Italian takes sixth place by a large gap before the Jungels, Yates, Mollema and Pinot group comes home.

Quintana takes third place, then Pozzovivo comes home for fourth. Then we have Zakarin - all in quick succession.

Nibali sits on Landa's wheel as they negotiate the final bends... and it's a fierce sprint in slow motion... but Vincenzo Nibali takes it by a whisker!

Landa is leading it out with Nibali in his wheel...

Under the flamme rouge and we're into the final kilometre.

The leaders enter Bormio and it's Landa driving the pace. He deserves the win after all the attacking he did from the break, but Nibali has played this one really well.

Quintana is closing in on Landa and Nibali now that most of the technical stuff of this descent is over. Zakarin has passed Pozzovivo, I think, behind. Dumoulin looks to be suffering from cramps.

Five clicks until this... and Dumoulin is dropping back - the latest gap is three minutes for the Dutchman.

Kruijswijk and Hirt are with the Pinot and Jungels chase group, with Formolo and Yates. Zakarin is a bit further ahead, behind Pozzovivo, Quintana, and then the two leaders, Landa and Nibali.

More heart-in-mouth moments for Nibali as he skids on a corner. Not holding back, is he? Pozzovivo has been dropped by Quintana - no surprise when you remember that crash he had a few years ago, which almost ended his career, if not life. Landa, meanwhile, is keeping up with Nibali. They lead the chasing group of Jungels etc by 1:25.

What Dumoulin can't do now is push things too much - it's far more important for him to get to the bottom in one piece, rather than try and save a few seconds and come a cropper. He's probably really weak following his illness and he may be a bit dozy, too.

Dumoulin is rallying. He's 2:15 down on the leaders, but making some inroads on Quintana. At this rate, he'll still be in pink today despite his big scare.

Nibali is almost on Landa's wheel now. Could he win the host nation's first stage in this race? This could kick-start his Giro. And he's not holding back: the Shark has just bunny-hopped over some water flowing across the road - just ahead of a hairpin bend...

Landa's lead is getting slimmer and slimmer... he'll be caught by Nibali soon, with Quintana right behind.

Here comes Dumoulin, who goes over the top 2:18 down on Landa - so that's about 2:10 down on Quintana. He can afford to lose another 30 seconds - not factoring in bonus seconds at the finish - if he wants to keep the pink jersey. This descent will be key.

Zakarin has joined Nibali and Quintana on the descent. They trail Landa by eight seconds.