"It's not your time son, not yet."

Jason Kenny, the defending champ, puts the burners on in the back straight and, by the time they come round the bend, Callum Skinner is eating his back wheel.

Here comes Kenny...

Two laps to go. These guys a room-mate, if you can believe that. Back straight. The bell...

Still slow. Skinner looks over his right shoulder...

Nice and easy. Pedals barely moving. We have to be 'walking pace' at least for half a lap...

Victoria Pendleton
Olympic cycling gold medalist

It will be very exciting. They have probably had a lot of practice against each other.

They know each other inside out.

I don't think we can underestimate Callum at the moment.

Skinner is on the inside. He will have to lead out in the first race. Possibly a disadvantage. Here we go...

Right then, here we go. Race one of three (if needed).

Men in blue on their bikes. Time for the Olympic final.

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

The semi-final for Kenny proved to be a phenomenal challenge. Thankfully he made it but it wasn't an easy one.

For Callum and Jason it is tough because they know each other's weaknesses and they know that each other knows that.

Also the coaches won't give any advice. They wont show favouritism so you have to work it out with your own experience.

Jason Kenny, remember, is the defending champion. He also won silver behind some fella called Hoy in 2008.

Callum Skinner, though, had the more comfortable route to the final.

So the sprint. How does this work?

Head to head, man to man. Three laps of the track. First two usually chess on bikes, the third hell for leather.

Best of three.

Gold medal - Ailya Mustafinapublished at 21:06

21:06

Gymnastics

Russian gymnast Ailya Mustafina has retained her Olympic title on the uneven bars.

Mustafina, 21, took gold with a score of 15.900 to add gold to the silver and bronze she had already won in Rio.

Chris Boardman
Olympic cycling champion on BBC TV

Cavendish cut his losses and showed a good sprint there.

I think it was a good race from him. There was a tactical error, that is what happens but his form is clearly there.

Mark Cavendish finishes sixth in the scratch race, the first event in the men's omnium - the decathlon of cycling, if you will.

Next on the track are Kenny and Skinner, along with the sprint bronze-medal race.

So the tennis final is under way, Murray in white versus Del Potro in blue. Best of five, so could be a long night.

Watch it here.

Britain's Olivia Federici and Katie Clark are 18th after the free routine in the preliminary round of the duet competition at Maria Lenk Aquatics Centre.

The duo scored 79.9667, 18.1000 behind leaders Natalia Ishchenko and Svetlana Romashina of Russia. They have the preliminary round of the technical routine on Monday.

Yep, Mark Cavendish is currently racing in the first of six events in the men's omnium - the only thing missing from his CV is an Olympic medal.

Event one of the ominum is the scratch race, which sees 18 men on the track at the same time, racing over a distance of 15km, with 40 points awarded to the winner, 38 to second and so on.

Anna Thompson
BBC Sport in Rio

A number of omnium riders elected to turn their legs on their bikes in the track circle as a last minute warm-up, including Team Sky's Elia Viviani, riding here for Italy and a strong contender for gold.

Cavendish, desperate for a first Olympic medal, is greeted with huge cheers when he makes his way onto the track.

Alistair Magowan
BBC Sport in Rio

Bryony Shaw has been in tears in the mixed zone describing her disappointment after ending sixth in the medal race to finish ninth overall.

The 33-year-old, who won bronze in Beijing, says that "mistakes and misfortune" have cost her and she remains "unfulfilled" after missing out on a medal for a second consecutive Games. 

Shaw started the week by having her fin snag on an anchor in one race before catching a plastic bag in another, and finished it by running into trouble when her Russian competitor cut her up at the start.

She remains undecided as to whether she will compete in Tokyo when she'll be 37, but then Nick Dempsey has just won silver at 36.