Yulia Efimova now moving on up...

At 100m it's Taylor McKeown of Australia in the lead, lanes four, five and six making the running, GB's Molly Renshaw and Chloe Tutton in the hunt for bronze?

Yulia Efimova paced her race oddly last night and she's at it again, very slow through 50m. British girls third and fourth. 

Rie Kaneto fancied for gold by the BBC comms box but it could be very tight indeed. Under way! 

GB's Ben Proud after qualifying for the 50m freestyle final: "It's great. British record or not it's a ticket to the final. My start wasn't as good as I hoped. I felt really good and composed and I'm really happy with that result. I think there's more to come tomorrow."

1 Chloe Tutton Great Britain

2 Rikke Møller Pedersen Denmark

3 Molly Renshaw Great Britain

4 Taylor McKeown Australia

5 Rie Kaneto Japan

6 Shi Jinglin China

7 Yuliya Efimova Russia

8 Kierra Smith Canada 

Chloe Tutton and Molly Renshaw both go for GB in this next final. 

Adrian Moorhouse
1988 Olympic 100m breaststroke champion on BBC TV

A brilliant start from Ben Proud. The fastest reaction in the field. He touched the wall right on the stroke, smack in the middle. You can tell he's really pleased with that.

Ben Proud clocked 21.54 seconds, he's the fifth fastest qualifier. Some big names haven't made it through. Anthony Ervin - winner in 2000 - was second in that semi. Be some effort to win 16 years on!

Andriy Govorov wins that semi-final as Ben Proud sets a British record in third! 

He will be in the final. Great swim. 

A football chant as the guys line up. This crowd loves a Brazilian swimmer.

Go!

Image source, Getty Images

Actor Matthew McConaughey is here again. I think he's going to play Michael Phelps in a biopic. I think he's here doing his research for the role, that's why he's here so often.

You cannot hear Helen Skelton talk as Italo Duarte and Bruno Fratus head out, two Brazilians in this semi-final. That's how loud the reception was. 

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

Ryan Lochte has won all of the world championships. Michael Phelps has won the last two Olympics Games. Those two have dominated this event for so long. So many Brazilian fans are hoping Thiago Silva wins. It's going to be interesting but you can't shy away from the fact that everyone thinks Michael Phelps is going to win.

Stay up for another hour to see two of swimming's greats go head to head...

And that's that. Great Britain weren't at their best but they've maintained their unbeaten Rio record. That superb finish from Nicola White will give them plenty of confidence ahead of their next game with the Untied States.

Semi-final two

1 Ítalo Duarte Brazil

2 Luca Dotto Italy

3 Cameron McEvoy Australia

4 Andriy Govorov Ukraine

5 Anthony Ervin United States

6 Benjamin Proud Great Britain

7 Bruno Fratus Brazil

8 Simonas Bilis Lithuania  

Ben Proud is up next for GB, he needs a time of 21.9 or somewhere thereabouts to get in the final. 

Florent Manaudou wins the first semi in a fast time of 21.32 seconds. The Frenchman took just ONE breath in fact. I was way out. Nathan Adrian second, Brad Tandy third.