Australia have four of the best 10 swimmers in the world in their team. All to do to beat them.

Another world record on the cards?

Women's 4x100m relay final

1 Japan

2 Netherlands

3 Canada

4 Australia

5 United States

6 Italy

7 Sweden

8 France 

Rebecca Adlington
Double Olympic gold-medal winning swimmer on BBC One

What a swim from Adam Peaty. Now he'll just want to get back to the village and get nice and rested for tomorrow's final.

If Adam Peaty does win gold on Sunday, he would be only the 10th man from Great Britain to win gold at the Olympics.

They are John Jarvis in both the 100m Freestyle and 400m Freestyle in 1900, Henry Taylor in both the 400m and 1500m Freestyle in 1908, Frederick Holman in the 200m Breaststroke in 1908, 4x100m Freestyle Relay in 1908, David Wilkie in the 200m Breaststroke in 1976, Duncan Goodhew in the 100m Breaststroke in 1980, Adrian Moorhouse in the 100m Breaststroke in 1988.

The last medal of the night/morning will come in the pool, as the women's 4x100m freestyle relay gets off at 03:24 BST.

No Team GB participation, so will it be gold for world record holders Australia or the United States?

We shall see...

It's just the second fastest time ever as Adam Peaty wins his semi in a time of 57.62 seconds.

Just outside world record pace at the turn for Adam Peaty....

Image source, EPA

Adam Peaty up early and into the lead after 20m...

Steve Parry
Olympic bronze medal swimmer on 5 live

Paint Adam Peaty green and he'd be Hulk. He's got muscles on his muscles!

Another world record? GO

Five-time Olympic swimmer Mark Foster: "After the turn Ross Murdoch was grabbing and snatching. He just revved it."

Ross Murdoch, speaking to BBC One: "It was pretty rough, that race. I'll need to go back and have a think what went wrong. You start slipping water and it costs you."

1 Vsevolod Zanko Russia

2 Dmitriy Balandin Kazakhstan

3 Cody Miller United States

4 Adam Peaty Great Britain

5 Felipe França Silva Brazil

6 Cameron van der Burgh South Africa

7 Li Xiang China

8 Christian vom Lehn Germany 

To put that winning time into context, Adam Peaty broke the world record earlier today at 57.55 seconds.

Here they come for semi number two. 

Steve Parry
Olympic bronze medal swimmer

I don't understand that at all. Ross Murdoch has gone slower than this morning. He seems to have changed his game plan to me. He looked to be really snatching at the end there.

Ross Murdoch clocked a time of 1:00.05. 

That will not be enough for Ross Murdoch to go through. He finishes sixth in the semi as Yasuhiro Kosecki of Japan wins in 59.23 seconds. 

Ross Murdoch's reaction time was the best of the eight, nothing in it after 25m.

Ross Murdoch goes for the final. And they're off!