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

Mark Cavendish is looking super sharp in the sprints, but not picking up all the points. This is anyone's race at this stage.

They say cycling is chess on wheels. This is like one of those giant chess sets you see outdoors, only the pieces are people in costumes, moving about when you're not looking. And bumping into each other. And racing.

Cavendish is trying to open the race or, open it as much as you can when there are riders covering pretty much every inch of the boards. The Manxman lies third overall at the moment, only two points ahead of Gaviria.

Chris Boardman
Olympic cycling champion on BBC One

Neutralising the race really changes the shape of things. They've almost reset. Everybody has had a breather and is coming back. It's a real bonus to those out on the attack.

Mark is stirring the pot, seeing what he can instigate. He knows somebody has to set off the first one.

With Cavendish trying to win a medal in the men's omnium, Laura Trott leads the women's event. Watch here as she wins the individual pursuit in 3:25.054 to open up a six-point lead after two events.

Luke Reddy
BBC Sport in Rio

Image source, .

Argentina are in the hockey house. Their fans have been superb across this Olympics from rugby sevens to last night's men's tennis final. Loud, proud and passionate.

They meet the supreme Netherlands in the women's quarter final later but first it's Great Britain v Spain - who are already warming up.

Team GB took bronze in 2012 remember so there is expectation aplenty. The men are out, it's up to the women to meet the target of one medal between the two GB teams. 

Image source, .

This points race will continue for some time - there's still the best part of 100 laps to go.

It won't finish until the women's hockey quarter-final between Great Britain and Spain is well under way.

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

It was Mark's fault, but it was not intentional. You could see him apologising to Viviani.

Cavendish has apologised to Viviani, which is the equivalent of waving to the driver whose car you've just written off.

There's still a rider down, Korea's Sanghoon Park has barely moved since the collision. A yellow flag has been shown, which means the race has been neutralised. Viviani is still in the race.   

Alex Kohnert: Watching Cav in the omnium on a train platform and never have I wanted a certain rail franchise to not be punctual in my life.

David Cawthray: Love the action from the velodrome. No idea what is happening in the omnium.

Anna Thompson
BBC Sport in Rio

There's great support for Mark Cavendish here and I've just spotted his wife Peta in the crowd, bouncing son Frey on her knees.

Daughter Delilah is here too but the noise is a bit too much for her as she keeps sticking her fingers in her ears!

Image source, Anna Thompson

Chris Boardman
Olympic cycling champion on BBC TV

Mark Cavendish could get a warning for that because he just swung down into him. That could be a real problem for Mark Cavendish. That's changing the shape of this race dramatically.

There's no other way to describe this. Cavendish has totally stuffed Viviani here. Straight across him, changing lanes without indicating. Viviani's front wheel clipped, down goes the Italian. 

Drama! Collision involving Cavendish! Leader Elia Viviani is down!

Lasse Hansen has lapped the field, meaning he earns 20 points. He's pushed Cavendish down into third overall.

GB's Freddie Woodward scores a solid 63.00 with his fourth dive in the Men's 3m springboard preliminary to keep himself in a strong position to qualify. This dive put Freddie in 5th with the top 18 qualifying for the final.

Jack Laugher's fourth round dive gets mixed reviews from the judges but scores a solid 70.20 to keep himself in a strong position for qualification.