Milak's Hungarian compatriot Tamas Kanderesi has launched a chase but Milak is still absolutely dominating this race. This is so impressive, and he is on 18.

This is going to be huge.

Kristof Milak has gone out at blistering pace. What a start.

He's more than a body length ahead at 50m.

Two finals to come now and first up is the men's 200m butterfly. Britain's James Guy should have been in this one after qualifying fourth fastest, but he has pulled out to focus on the 4x200m freestyle relay, which is coming up next.

Olympic bronze medallist Tamas Kenderesi and fellow Hungarian Kristof Milak – the world junior record holder – lead the way going into this race.

Image source, PA

Faulkner slips back a bit in the last 50m and finishes fourth in this semi-final.

Heemskerk takes the win with Russia's Anastasia Guzhenkova second and Spain's Melanie Costa Schmid third.

The good news though is that both Holly Hibbott and Ellie Faulkner are through to the final.

Following in Hibbott's footsteps, Ellie Faulkner is third at the first turn and she is looking strong.

At 100m, she moves up into second behind Femke Heemskerk of the Netherlands.

It's third for Holly Hibbott in 1:58.40.

Charlotte Bonnet takes the semi-final win in 1:58.12 with Valeriia Salamatina of Russia second.

Image source, AFP

Huge start from Charlotte Bonnet of France and she's almost a body length ahead before the first 50m is done.

Holly Hibbott is third at the first turn, and stays there at the second. Time for her to make her move.

Image source, AFP

Time for the women’s 200m freestyle semi-finals now and Holly Hibbott and Ellie Faulkner are flying the flag for Britain.

Watch Hibbott in the first semi-final, while Faulkner goes in the second alongside fastest qualifier Femke Heemskerk of the Netherlands.

At 30, Heemskerk is the oldest in the field but it was a very impressive swim from her in the heats this morning.

Second for Mark Szaranek behind Switzerland's Jeremy Desplanches.

That's both British swimmers through to tomorrow's final. Litchfield qualifies second fastest and Szaranek fourth.

Image source, Getty Images

Szaranek made an absolutely superb turn at 100m though and he's really pulled this one back on the breaststroke.

He's into second coming into the last length.

The second semi-final is under way now and Britain's Mark Szaranek hasn't made the best start. Plenty of time to amend that though and at 75m he's already starting to come back.

Max Litchfield slips into second behind German Philip Heintz on the last 50m and that's how it finishes.

The Briton will be easily through to the final with that though, a good test ahead of tomorrow.

Image source, PA

Max Litchfield is ahead by 0.48 at halfway. He'll want to open up more of a lead on the breaststroke though.

European champion Georgia Davies told BBC Sport: "I tried my best to stay relaxed and just focus on myself this evening.

"Just to get the win, that's all I care about - ultimately it's about the medals more than the times and I'm so so happy.

"I think 27 is the new 18 really!"

And we’re back to more semi-finals. This time it’s the men’s 200m individual medley and Mark Szaranek and Max Litchfield provide the British interest in this one.

They set the fastest two qualifying times in the heats this morning, closely followed by Duncan Scott, but with only two swimmers from each nation allowed in the semi-finals, Scot Scott missed the cut.

Litchfield is in the first semi-final and Szaranek is in the second.

Andy Jameson
Commentator and former Olympic swimmer on BBC TV

What a fantastic swim it was.

A good start, she wound it up, she stayed in control - she stayed relaxed and that's how to win gold on the 50m backstroke.

Image source, Reuters

Georgia Davies looked quite nervous as she walked out. Time to see what she can do.

They're off. It's only 50m so this will be short and snappy.