Great Britain strike first in their women's quarter-final tie. 

Georgie Twigg gets the crucial intervention from a penalty corner.

Nothing less than the Brits deserve, they've controlled the tempo of this first quarter from the off.

What a battle! Cavendish and Viviani. The Briton can't get round the Italian, but the three points he gains puts him level with Hansen. Silver is there for the taking. Two to go...

Cavendish looks good for at least bronze - he's 12 ahead of fourth. He's two off Hansen with three sprints to go. You'd expect the Manxman to have the speed...

Chris Boardman
Olympic cycling champion on BBC Two

Hansen is going for the attack here and Cavendish is a long way back at the moment. He's just gone again over the top - he's trying to bludgeon them into submission. It's turning into a real slugging match.

Cavendish was out of the running in the latest sprint, Lasse Hansen taking two points. The Dane, who won gold in 2012 continues to attack, maybe looking to pick up a lap. Danger.

Alistair Magowan
BBC Sport in Rio

Image source, BBC Sport

The Laser Radial medal race wasn't the only one to be postponed because of high winds, and according to double Olympic sailing champion Shirley Robertson, it was a lot more hairy out to sea as she filmed with the BBC TV crew.

She says: "Within 10 minutes of the 470 boats being sent out to the ocean because there was no wind, we saw this black line of weather coming in from the west and it hit us and the entire fleet. It was 40 knots, which is gale force, and there were boats upside down everywhere. 

"We were with the 470s and they are pretty manageable, so once they got upright, they can drop their big sail and just come in as best they could with their small sail.

"But the 49ers were also out there; they are light skiffs and they are difficult to handle and some of them might have had a big issue to get back to safety."

Fortunately, the wind has since dropped and we are told that all the boats have returned safely. 

Not good from GB's Jack Laugher, whose fifth-round dive only scores 55.10, but with one dive to go he still has a good chance of qualifying for the final.

Cavendish also level on points with second-placed Hansen. If riders finish level, places are decided on where you finish in the final sprint.

Oh yes! Cavendish nails five on the latest sprint, picking up two on Viviani. There's still time for Cavendish to chip away on the gold medal.

Cavendish is one point clear of fourth. He's grimly hanging on to that elusive Olympic medal. He's five points off silver and 10 points away from gold.

An Ageing Cricketer: The Omniun, I've no idea what's going on but it's compelling. Come on Mark Cavendish.

Matthew Lloyd: Got a horrible feeling Cavendish might get badly 'told off' after this race.

Jon Hersom: The way these guys are swerving around all over the track it’s remarkable there’s only been one crash so far.

There are five sprints remaining, so a maximum of 25 points, unless Cavendish can lap the field. There's a slight lull in the action. Cavendish not involved in this latest giveaway, but leader Viviani picks up three.

Alistair Magowan
BBC Sport in Rio

Somehow it has been a dramatic day at the sailing without seeing much action at all. Rio has that sort of effect on things. 

After no wind all day, the women's Laser Radials went out for their medal race and when a front blew in, organisers then decided it was too windy, making it a frustrating day for the likes of Annalise Murphy, waiting to win a first Irish sailing medal for 36 years, and her watching family.

Double Olympic champion and BBC TV reporter Shirley Robertson says: "They are the top 10 sailors in the world so you could argue 'let them go out there' and race but it was probably a sensible decision given there were gusts of 36 knots, which is the top end of the scale." 

No confirmation of tomorrow's schedule yet but the Laser Radial and Laser medal races are likely to kick things off. 

Chris Boardman
Olympic cycling champion on BBC TV

Hansen really feels under threat here from Mark Cavendish. Cavendish has really been closing that gap and he's not too far - if he keeps sprinting like he is, the strategy he's employing now could well do the job and take him a gold medal.

Don't forget that women's quarter-final. It's just about to begin - the teams are currently singing the anthems. We'll be all over that once I've figured out what on earth is going on in this omnium.

GB's Freddie Woodward has a 'little bit of a wobble' with his fifth-round dive, receiving a score of 52.50. He has one more dive to try to book his place in the final.

Little gains for Cavendish. Wins the next sprint. Five points gained. He's three points behind Hansen, who sits second.