Back to the track... it is the first of the women's 400m semi-finals. Britain's Ama Pipi in lane two. First two through automatically...

Denise Lewis
Olympic heptathlon gold medallist on BBC TV

That's a really good banker - KJT has nothing to lose on that third and final through.

She needs to work those legs - there is 14m in there.

Steve Backley
Two-time world javelin silver medallist on BBC TV

That's a much better throw from Johnson-Thompson. That makes a huge difference when you talk about the accumulation of points. She's closed the gap on much better throwers, she is more of a sprinter and jumper.

A season's best and one throw remaining.

What's KJT got in her locker, then? Here comes the Liverpudlian with her second throw... 13.31m! That's a seasonal best.

The improvement was all in the hips, says the legendary Jess Ennis-Hill.

Well, I'm slightly paraphrasing but that was the gist. Always good advice. Ask Happy Gilmore.

Meanwhile in the diving pool...

KJT produces a first throw of 11.94m. That's a "modest" start, according to Steve Backley on comms.

Katarina Johnson-Thompson lags behind arch-rival and reigning champion Nafi Thiam in the shot put on personal bests – 13.86m v 15.41m.

The Brit has only thrown the shot competitively once since winning the 2019 world title in Doha due to an injury-disrupted 2021.

Here she goes...

Super run by Britain's Laura Muir. She's through to the final!

Muir takes Hall on the bend to lead, before Sifan Hassan strikes to come through for victory. the Scot doesn't respond, she doesn't need to.

Comfortable progress in a time of 4:00.73.

Australia's Linden Hall leads as we hear the bell. Laura Muir is on her shoulder. Five to go through automatically.

Laura Muir has had several near misses in the big events - is this finally going to be her time? The Scot bides her time on the first lap, lurking with intent at the back as she assesses the situation. Then she makes her move...

Eyes on the field, eyes on the track... eyes everywhere. It's all going on.

Britain's Laura Muir is limbering up on the start line. It's second semi-final time...

KJT looks a bit glum as she waits to start the shot put. The sort of face I'd imagine she pulls when Liverpool lose at Old Trafford.

Let's hope that's just her game face and not because of any injury concerns...

Steve Cram
Athletics commentator on BBC TV

"It's the top five that go through and the two fastet losers. They have set off with real intent - almost Diamond league pace from Japan's Tanaka.

"Sometimes when a fall happens, you take advantage of the split in the group.

"Katie Snowdon struggling to keep up with the pace but there could well be fastest losers' spots for someone else as this was very quick."

Can Katie Snowden climb the mountain in the final lap? Unfortunately not.

The Briton finishes ninth in a time of four minutes 2:93 seconds.

Faith Kiyegon looks at the clock as she rounds the final bend. She'll be happy with what she can see. This is rapid.

Kiyegon stretches out to cross the line in 3:56.80. Wow.

"That has got to be the quickest heat ever in a major championships," says BBC commentator Steve Cram.

Let's head back to the Olympic Stadium, shall we?

It is time for the women’s 1500m semi-finals. The first five in each semi-final - plus the next two fastest - go into the final.

As she did in Monday’s heats, Britain’s Katie Snowden has gold-medal favourite Faith Kipyegon in her race. Kipyegon is the reigning champion who has returned from time out to have a baby in better form than ever.

Kipyegon leads going into the bell, with Snowden at the back of a leading pack of about eight runners. Suspect the pace is catching up with her though...

BBC Sport

Eilidh McIntyre on following in the footsteps of her father Mike in winning sailing gold:

"I've wanted this my entire life, with my dad's (gold medal) - it's such an amazing feeling and I can't wait to have it.

"Just thank you [her father] for being my inspiration, and being at the end of the phone when I wanted to talk. But not only him, my whole family. My poor mum, she's had to live through this twice and the stress of it. My sister, my brother, my fiance John, my total rocks . Thank you everyone. Nothing's good enough but gold in this family and they've all been on this journey."

BBC Sport

Hannah Mills, speaking to BBC Sport: on what it means to win:

"It's massive. Its been one of the hardest weeks of my life. I'm sure for Eilidh as well. Just every day feeling sick, not being able to eat, just nerves building up and the emotion of 'we've done it', so we've done what we came here to do."

Mills on being the most successful female British Olympic sailor:

"It's absolutely mad, Growing up, like a lot of Olympians, I dreamed of being here one day and standing on top of the podium and to do it twice with Saskia (Clark) before and with Eilidh this time, I've had two incredible crews to sail with and I feel incredibly lucky."

Before we focus on KJT, let's get in the medal-winning mood by looking back at some British success earlier in the sailing.

Hannah Mills became the most successful female sailor in Olympic history as she and Eilidh McIntyre won 470 gold at Tokyo 2020.

The British pair finished fifth in the medal race, but their earlier performances meant it was enough to hold off silver medallists Poland and France in bronze.

Watch how they did it...