Welcome to LIVE coverage of stage 18 of the Giro d'Italia - a 20.6km uphill time trial from Mori to Polsa.

New top three on GC: 1. Nibali, 2. Evans +4:02, 3. Uran +4:12, 5. Scarponi +5:14, 6. Niemiec +6:09

Top five today: 1. Nibali 44:29, 2. Sanchez +58, 3. Caruso +1:20, 4. Scarponi +1:21, Majka +1:25.

Heartbreak for Samuel Sanchez who came so close to winning the stage before seeing his time totally destroyed by Nibali.

Maglia rosa Vincenzo Nibali punches the air as he crosses the line to take the win by 58 seconds on Samuel Sanchez - and by doing so, cementing his lead at the top of the standings.

Cadel Evans is out of the saddle and giving it his best shot - but the damage is done. He crosses the line 1:38 down on Sanchez in 24th place.

Cavendish may keep the red jersey tonight because Evans will struggle to finish in the top 12.

Nibali has almost caught Evans - this is an extraordinary ride from the Italian. A combination of that and a terrible ride from the Australian...

It's the fifth fastest time for the Colombian, 28 seconds slower than Sanchez. He managed to close the gap over the second half, but that was not the ride he needed to put the pressure on Nibali.

Uran next to finish - and he's suffered in this time trial...

Here comes Michele Scarponi, the 2011 de facto winner. It won't be the winning time - that rain clearly affecting his ride on the second half of the test. The Lampre veteran crosses the line 22 seconds down in third place. Sanchez stays at the top.

Przemyslaw Niemiec (Lampre) has had a solid ride today. The Pole crosses the line in ninth place, 58 seconds down. He won't rise or fall in the standings today.

Nibali has put two minutes into Evans now as the rain gets heavier and heavier.

Mauro Santambrogio has another off-day. The Italian, who won atop the Jafferau, comes home with the 20th best time, 1:35 down on Sanchez.

Evans is currently 1:40 down on Nibali according to on course times. The Australian has not had a good day. He also needs to finish 12th or better to take the red jersey from Mark Cavendish's shoulders...

Carlos Betancur (Ag2R-La Mondiale) approaches the finish now and he's dancing out of the saddle. The Colombian has slowed on the second phase of the TT - but only just. He comes home in fourth place, 34 seconds down, which means Majka moves back into the lead of the youth standings by two seconds. A fabulous duel we have there...

Poland's Rafal Majka (Saxo-Tinkoff) comes home for third place, 27 seconds down on Sanchez. Great effort from the youngster - but it is enough to take the white jersey back from Betancur? We'll find out very soon...

Robert Gesink had a pretty torrid time out there, crossing the line in 20th place and almost two minutes down on Sanchez. The Blanco rider could drop out of the top 10 tonight.

Nibali is having a storming ride: he takes 30 seconds off Scarponi at the first check and is 1:23 ahead of Evans at the half-way stage.

Evans is almost a minute down on Scarponi at the first check...

It's raining quite hard now - just as Scarponi is on that small descent. He has to take some of the corners rather gingerly - and he (and the others) could lose time here.