Good start for GB in the women's sevens. New Zealand up next!

Adrian Moorhouse
1988 Olympic 100m breaststroke champion on BBC TV

You see the victory [for Caeleb Dressel] right there. Tight but clear!

Andy Jameson
Commentator and former Olympic swimmer on BBC TV

What a swim by Caeleb Dressel. His start was out of this world!

Kyle Chalmers is on the charge...the Australian is closing in on Caeleb Dressel.

Caeleb Dressel leads after 50m...

American star Caeleb Dressel in the water next. He has big flippers to fill after being billed as a potential successor to Michael Phelps', the most decorated Olympian ever.

A new Olympic record for China's Yufei Zhang. Totally dominated from start to finish.

Regan Smith, the 200m backstroke world-record holder takes silver, with her US team-mate Hali Flickinger collecting the bronze. They never got close.

Alys Thomas finished seventh from lane eight.

Commonwealth champion Alys Thomas squeezed into the women's 200m butterfly final. What can she do here?

China's Yufei Zhang has set off like a torpedo.

Image source, Getty Images

Freya Anderson, who failed to make the women's 100m freestyle final, speaking to BBC Sport: "I feel OK.

"I'm trying to not let this set me back more. Just thinking about the year that I have, I've really not had a good run in.

"I think, maybe this was meant to happen for a reason? Looking back, I've probably only got in about six weeks of proper training, I had illnesses leading up to this. I'm just happy I got to come and experience this really.

"Next year is very busy, so hopefully I can get my head down in training and get a good block in."

Vicky Thornley continues her bid to add a single sculls medal to the double sculls silver she won with Katherine Grainger in Rio.

Image source, Getty Images

If you say you predicted Sepp Straka would be setting the pace in the first round of the men's golf, then we don't believe you.

The 28-year-old Austrian, who is ranked 161st in the world and only made the cut in two majors, is seven under after 16 holes at the Kasumigaseki Country Club.

Straka has a three-shot lead over Belgium's Thomas Pieters and Denmark's Joachim Hansen.

Home favourite Hideki Matsuyama - the Masters champion, of course - is three under, as is Great Britain's Paul Casey.

Fellow Brit Tommy Fleetwood has just started his round, but is already one over after a bogey on the first.

Better news for Ireland's Rory McIlroy, though. The four-time major winner is one under after three holes, with playing partner Collin Morikawa - who won the Open last week - still level.

Image source, Getty Images

Oh hello. Britain’s 2019 World Championship bronze medallist Luke Greenbank is through to the final with a world-class swim. The 23-year-old finished ahead of defending champion Ryan Murphy of the USA to win that race.

World champion Evgeny Rylov of the Russian Olympic Committee set the quickest time overall in the first semi-final, which saw Brodie Williams' hopes go up in smoke.

Still a good first Olympics for the 22-year-old.

Simone Biles has had quite a lot to deal with over the last few days.

The four-time Olympic gold medallist, multiple world champion and arguably the greatest gymnast of all time - withdrew from the team and all-around events at the Tokyo Olympics, which was headline news across the US and the world.

The American, who is a sexual assault survivor,spoke about the importance of preserving her mental health and the need to "protect our minds and our bodies," adding: "We are people, at the end of the day."

And she has taken to Twitter, external to thank those who have sent her words of support and encouragement.

Freya Anderson is out. She is one of Britain’s brightest prospects, and reached a stacked 2019 World Championship 100m freestyle final but no such joy this time around.

Much better news in the second semi-final. Anna Hopkin qualifies with a fourth-placed finish.

Image source, BBC One

Image source, BBC One

Image source, PA Media

James Wilby, who finished sixth in the men's 200m breaststroke final, speaking to BBC Sport: "Physically - and mentally - it hurts.

"I said throughout that it was always going to be that race. It wasn't quite there. The result, it is what it is.

"It is hard. The way I swim, it's got to be. perfect balancing act. If I'm off ever so slightly, it really pays in a bad way. It's something that I really enjoy doing - for balance - but it hasn't really paid off this Games, unfortunately."

We have got defending champion Penny Oleksiak of Canada and Australia’s Cate Campbell, a three-time Olympic champion in this race as well as GB's Freya Anderson.

Anna Hopkin, who broke the 12-year-old British record in the heats is up next for GB in a tough race featuring Australia's new Olympic record-holder, Emma McKeon, and Sweden's world record-holder Sarah Sjostrom.

Could be over rapido.