It's all over. Huge upset!

Andy and Jamie Murray are OUT of the men's doubles after losing to Brazil's Thomaz Bellucci and Andre Sa following an epic, epic tie-break.

Huge cheers from the home fans in the stands. They're loving this. 

Yes, is the answer [02:24 BST entry]. We're back all square again - 13 apiece. 

We have GB interest in this race too, Chloe Tutton going for a place in the final. The 20-year-old broke the British 200m record earlier this year. 

Image source, Getty Images

Adrian Moorhouse
1988 Olympic 100m breaststroke champion on BBC TV

That was an important third place for James Guy in the first semi-final. Australia's Thomas Fraser-Holmes who came sixth in the second semi-final misses by one one-hundredth of a second.

Image source, Getty Images

All eyes will be on Russian Yulia Efimova in her 100m breaststroke semi-final  at 02:37 BST.

She was banned for 16 months in 2013 after traces of an anabolic steroid were found in her system.  

The 24-year-old appealed to the Court of Arbitration for Sport (Cas) after the International Olympic Committee ruled any Russian athlete who had been sanctioned for doping would be banned.

Earlier this year she was given a provisional ban after testing positive for meldonium, but the International Swimming Federation lifted the suspension after advice from the World Anti-Doping Agency (Wada).

Cas has ruled that athletes cannot be banned from Rio on the basis that they have been previously sanctioned.

A sixth match point for Brazil. Have Andy and Jamie Murray got anything left in the tank?

Novak Djokovic lost the first set to Juan Martin del Potro, and it's on serve in the second at 4-3...

Still we go on! A fourth set point for Great Britain goes begging and it is 12-12. Brazil are not giving up this set up without a fight.

Sarah Sjostrom breaks the world record in the women's 100m butterfly final to become the first Swedish women to win an Olympic swimming gold.

China's Sun Yang comes back to power past Chad le Clos and easily win in 1:44.63.

That was seriously impressive.

James Guy is IN the final. 

Britain's Adam Peaty - hot favourite for gold in the men's 100m breaststroke - has his parents and girlfriend in the arena to support him.

Chad le Clos makes a phenomenal start from lane five - he takes half a second out of the field in the first 50m...

Bang! Away. James Guy the most interested spectator for this one. Will his time prove fast enough?

Andy and Jamie Murray save a fifth match point with the first ace of the match and they are on the verge of clinching this set after an epic tussle.

Semi-final two

1 Cristian Quintero Venezuela

2 Thomas Fraser-Holmes Australia

3 Townley Haas United States

4 Sun Yang China

5 Chad le Clos South Africa

6 Kosuke Hagino Japan

7 Dominik Kozma Hungary

8 Aleksandr Krasnykh Russia

Briton James Guy, who finished third in his semi-final, speaking to BBC Sport: It was OK. I was a bit slower than this morning. I'm not sure what happened. Hopefully I'll be safe for the final tomorrow night. 

Goalless after 17 minutes - it's been a night of upsets so far. Can Iraq force another one?

Andy and Jamie Murray are hanging in there. They've saved four match points and it is all square in the tiebreak. Tense.

Adrian Moorhouse
1988 Olympic 100m breaststroke champion on BBC TV

James Guy was working really hard at the end. I think he put a lot into that race. Not sure how much more he's got.

James Guy is the world champion in the 200m free. Now he has a nervous wait to see if that time is enough.

Rebecca Adlington feels he needed a 1:45...