Ireland's defending lightweight champion Katie Taylor is beaten in the quarter-final by Mira Potkonen of Finland.

There are tears and recriminations down at the beach in Rio - France's Aurelie Muller (white hat) has her silver medal taken away after replays show she effectively grappled Italy's Rachele Bruni out of the way in a desperately close finish.

So Bruni moves up to silver behind Van Rouwendaal, and wouldn't you know it? Brazil take bronze with Poliana Okimoto.

"It was a full-on wrestling match by Muller on Bruni," says BBC Sport's Andy Jameson.

Even so, 10 kilometres is a long way to swim for a disqualification.

Great Britain's Laura Trott finishes second in the omnium scratch race in a dramatic sprint for the line. 

Tatsiana Sharakova was so far clear that she was always going to win, she might have been a lap ahead, but Trott was the best of the rest with a great burst.

Image source, #bbcrio2016

There's been a big crash, which has taken down a couple of the riders in the omnium scratch. Laura Trott is OK though.

Image source, Reuters

Belarus' Tatsiana Sharakova leads the omnium scratch by half a lap with 10 laps to go.

Anita Wlodarczyk, the big favourite in the women's hammer throw, has just thrown a massive 80.40 metres on her second attempt.

That's not far off her own world record of 81.08.

Sophie Hitchon still in bronze medal position.

Two riders have made their move in the omnium scratch, well ahead of the field. There are 15 laps left.

That's superb work from Marcus Ellis and Chris Langridge to make their way into the men's doubles semi-finals.

There was a spirited fightback from Japan duo Hiroyuki Endo and Kenichi Hayakawa in the second game but it's the Brits who won 21-17. There's tears and hugs galore from the British pair.

Image source, Getty Images

Great Britain's Sophie Hitchon has fouled with her first throw in the Women's Hammer final. Hitchon finished fourth in last year's World Championships.

There are 22 laps to go in the omnium scratch race, Laura Trott is halfway back but slowly moving forward.

Oh, hello.

Britain's Sophie Hitchon is in the medals as it stands in the women's hammer throw.

After fouling her first attempt, she's unleashed an effort of 73.29 metres and that means third place for now.

Anne Richardson: Loving watching Mark Cavendish and Chris Hoy being interviewed in the velodrome, chatting away like mates in the pub.

Nico Cary: What a natural chat between @chrishoy and @MarkCavendish you don't see that everyday! Loved it

JAB: Cavendish and Hoy there more like two mates chatting in the park than an interview. Very relaxed, top stuff.

GB's Fiona Bigwood makes a strong start with horse Orthlia in the Dressage Individual Grand Prix Freestyle, with a score of 76.018% for their test.

The sun is out, the music is playing and the Dressage Individual Grand Prix Freestyle is under way as Charlotte Dujardin looks to defend her London 2012 title.

The 31-year-old from Enfield is seeking her third Olympic gold medal when she goes at 16:40 BST three days after helping defending champions Great Britain secure silver in the Olympic team dressage.

Also going for GB are Carl Hester (15:35 BST), while Fiona Bigwood, who fractured her skull in 2014, has already completed her routine and scored 76.018% aboard her horse Orthilia. The current leader is Steffen Peters of the United States with 79.393%.

Image source, Getty Images

Confirmation that Mark Cavendish is third in the omnium after four of six races in the men's event. And the Manxman is level on points with second place.

Image source, .

Here come Laura Trott and co for the women's omnium scratch race. 

This is race one of six in the event, and it's a 10km one.

We are under way.

Olympic sprint champion Anna Meares is out of this year's event after being beaten in a 1/8 final repechage.