Adam Peaty wins 100m breaststroke gold in world record time
Wales' Jazz Carlin wins 400m freestyle silver 14 minutes later
USA's Michael Phelps wins relay to claim his 19th gold
Murray brothers and Williams sisters out of tennis doubles
Djokovic loses in tennis singles first round
Men's 56kg
Image source, .We've just completed the snatch segment of the men's 56kg weightlifting, and China's Long Qingquan has matched the Olympic record of 137kg, set by Turkey's Halil Mutlu at Sydney 2000.
An impressive marker laid down by Qingquan, who had failed to lift 135kg on his previous attempt. But it's on we go, the clean and jerk awaits.
Murrays on court
Jamie and Andy Murray are out on court for their men's doubles match against Brazilians Thomaz Bellucci and Andre Sa.
You can watch on BBC one right now.
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Craig Stewart-Toner: Oh goodness, BBC interviewing a swimmer who finished 1st in her heat. She's 13. 13! Feeling very old and very useless.
Lee Fergusson: I am staying up for Peaty, I have to go to work as well the next day but luckily don't have to get up that early
Image source, BBC SportNepali 13-year-old Gaurika Singh is the youngest athlete at Rio - but she isn't just here to make up the numbers.
She won her heat in the women's 100 metres backstroke on Sunday, despite her dad admitting that "it wasn't in [their] plans" for her to be competing at an Olympics so soon.
"I’m in year 9 at school, our new year starts on September 6," she said.
"I first started swimming when I was in Scotland – my dad forced me to go. I got serious when I was nine, when I started to love swimming."
When she was nine. She's now 13. Competing at an Olympics.
"I won my heat and I’m really proud for my country," she added, with a grin that spoke of enthusiasm far greater than the words ever could.
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The real question here is: How good would Johnny Vegas look sporting that fine, yellow handbag?
Many listeners have been confusing Craig with the comedian during his commentary on the gymnastics.
Coming up
James Guy, Chloe Tutton, Adam Peaty, Jazz Carlin, Chris Walker-Hebborn and Georgia Davies are all in the pool for Team GB tonight.
Adam Peaty's mum has flown out to Rio to watch her son - she had never flown before. That's commitment.
Looks like the BBC's swimming team are having fun by the pool...
Image source, Instagram
Image source, Getty ImagesPlenty. That's what:
Williams/Williams 3-6 4-6 Safarova/Strycova
Image source, Getty ImagesWell, well, well. Fans of a shock are going to be happy with this result.
Serena and Venus Williams' hopes of a fourth straight Olympic gold in the women's doubles are over.
The American pair lost in straight sets to Czech Republic's Lucie Safarova and Barbora Strycova.
About time they let someone else have a crack. Although Venus apparently struggling with sickness is more likely to be to do with their surprise defeat.
Men's 100m breaststroke final (02:53 BST)
Mark Foster
Former freestyle world swimming champion on BBC TV
Adam Peaty's attitude is "it's just another two lengths". It's about "me, water and the wall" - he has supreme confidence. If he has a bad day then he can still win. None of the others look in any shape to push him.
He will win that Olympic gold and it's whether he breaks the world record. if you look back at what Peaty has done last few years - he won the 50m & 100m freestyle at the Commonwealths and Europeans.
Peaty keeps going faster. He just kicks differently than everybody else.
Men's 100m breaststroke final
Now the world's swimmers are scared of him. Adam Peaty goes at 02:53.
British swimmer and world record holder Adam Peaty. speaking to Rebecca Adlington before the Games: "If someone unknown does pop out in Rio then I welcome the challenge. It's not cockiness, it's confidence.
"I am in the best possible shape I could be in."
Image source, Getty ImagesAdam Peaty goes for gold in the 100m breaststroke at 02:53 BST.
Got your cocoa? Wrapped up under a blanket? Eyes slowly closing?
Fight the feeling. Just fight the feeling.
Here's your reward if you stick it out tonight.
Image source, .Boxing
Image source, Getty ImagesJoshua Buatsi made it four from four for British boxers navigating the first round earlier on, in some style too.
He became the first boxer to stop his opponent this Olympics, clubbing Ugandan veteran Kennedy Katende into submission in the third round after landing clean shots throughout.
"He was a tough guy, but my aim is to get anyone who’s in front of me out, to eliminate them," said Buatsi.
"I’m just glad that he’s okay."
Image source, Getty ImagesSome live British action to get your teeth into.
Liam Pitchford is set to face South Korea's Jung Young-sik in round three of the table tennis and you can watch it here.
Cast iron favourites
We're not sure we can recall a British athlete being as big a favourite to win an Olympic gold as Adam Peaty is tonight.
Can you?
Mo Farah? Steve Redgrave?
Surely nobody was ever 1/100 at the bookies...
Let us know on #bbcrio2016