Still nearly 3,000m to go. The gap is getting bigger.

GB 0.3 seconds behind...

Lead cut. Burke on front for GB. Doull next...

Australia are the world champions and lead after the first lap...

Wait for the buzzer. Men in blue v men in gold. 4,000m. Under way...

Chris Boardman
Olympic cycling champion on BBC TV

It is a difficult position for GB to be in because it really is all their's to lose.

Here come the GB team, climbing the stairs to the wooden track. The four bikes are lined up, held by men in blazers. Little wobble by someone there...

The men in red ease down to the line such is their margin of victory. Denmark take bronze in the men's team pursuit. 

Denmark well in front here, looking good for the bronze...

GB sprinter Callum Skinner beat Patrick Constable of Australia easily enough earlier on. Oh wait, he's racing him again on Saturday...

Anna Thompson
BBC Sport in Rio

The family and friends of German team pursuiter Domenic Weinstein aren't hard to spot and they are in full voice as they cheer their man home to fifth place.

If you need an idea of what is going to happen between GB and Australia, then see this Denmark-NZ clash as a dress rehearsal. 16 laps of the 250m course, 4,000m in total. Fastest team wins. It's called the pursuit because the teams start at opposing points. If you catch your opponents, the race is over.

Sir Chris Hoy
Six-time Olympic cycling champion on BBC One

Bringing Bradley into the team has been a masterstroke.

His status, his leadership, everyone has used him to shoulder the pressure coming into Rio.

It has gone as well as anyone could have hoped.

The GB team are in the centre of the track, three of them sitting, Burke rising to his feet. I thought that the Denmark v New Zealand bronze medal race began some time ago, but the teams are just taking to the track.

This your final warning. Great Britain are going for men's team pursuit gold in the next couple of minutes. Owain Doull, Steven Burke, Ed Clancy and Sir Bradley Wiggins. For Wiggins, history beckons. A medal guaranteed, he will become the most decorated GB Olympian of all-time. 

OK - so here's the equation for Great Britain's men.

That draw with Spain means they need Belgium to beat New Zealand, if that happens, then GB go on to the quarter-finals.

It's currently 0-0 between those sides, and a Belgian goal is very much the order of the day.

Watch Belgium v New Zealand here.

I said that Andy Murray has spent most of the last two days on court, mainly because he keeps finding himself up against it.

Well, he and Heather Watson are in a spot of bother in the first set of their mixed doubles quarter-final with Inida's Sania Mirza and Rohan Bopanna.

Murray is serving at 3-5 down. An earlyish break. 

Mel Clewlow
Ex-GB hockey player

It's a nightmare, any British fan will be glued to social media for the next hour to follow the other results.

The positive is that it was a big improvement on the other performances.

All over. Great Britain miss out on the win they need, even hitting the post in the dying seconds. They are incredibly close to the exit and need other results to go their way if they are to reach the last eight.

Sir Chris Hoy
Six-time Olympic cycling champion on BBC One

For the team pursuit to have gone that quick in the semi-final shows they have confidence. 

I reckon they will go at least a second quicker in the final.

They might even catch the Aussies.