Chelsie Giles wins judo bronze - GB's first Tokyo 2020 medal
Bradly Sinden wins silver after defeat in men's taekwondo final
Austria's Anna Kiesenhofer seals shock women's cycling road race gold; GB's Lizzie Deignan 11th
Defending taekwondo champion Jade Jones suffers shock first round defeat
Andy Murray out of tennis singles with thigh strain; world number one Ashleigh Barty beaten in women's singles
Adam Peaty wins 100m breaststroke semi-final
Men's street
Marc Churchill
Skateboarding commentator on BBC TV
Absolutely huge day. I can't believe we've finally reached it: the debut of skateboarding in the Olympics!
It's going to be amazing.
Men's street prelims
Image source, Getty ImagesSkateboarding - new to the Games - is under way at the Ariake Sports Park.
Its Games debut features two disciplines: street and park. The street course emulates a real street filled with obstacles to perform on, including rails, stairs and benches.
Park takes place on giant concrete bowls with steep, curved walls that help the skaters launch themselves up to three metres in the air and perform mid-air tricks.
Is this the coolest Olympics ever?
It's another scorching day in Tokyo. And more Olympic history is being made right now.
Natalie Pirks
BBC Sport correspondent in Tokyo
The women in the artistic gymnastics are in action today and that gives us our first look at Simone Biles at these Games.
She won four golds in Rio and she has a new move on the vault in Tokyo. If she lands it, it will be the fifth move named after her.
That's how much of a legend she is.
There were 11 golds on offer on Saturday. There are 18 today - and Team GB will be hoping to medal for the first time at these Games.
Image source, Getty Images
Image source, Getty Images
Image source, Getty Images
Image source, Getty Images
BBC One
It's another packed day of sport in Tokyo and the BBC has it covered.
BBC One and BBC Two is broadcasting more than 350 hours of action - covering all 33 sports - with a second stream available on BBC iPlayer, BBC Red Button, the BBC Sport website and the BBC Sport app.
BBC Radio 5 Live and Sports Extra also bring you live commentary every day, plus a daily podcast on BBC Sounds, and there will be live text, video clips and highlights on the BBC Sport website and app.
BBC One's coverage of Sunday's events is already under way. JJ Chalmers is presenting.
Team GB
Team GB
What's on offer over the next few hours for Team GB fans?
Well, it's a H-U-G-E day for Jade Jones, the 28-year-old from Flint who is aiming for a third consecutive Olympic taekwondo gold.
She is in -57kg round of 16 action at 03:52 BST but could end the day with another gold around her neck - the final is scheduled for 13:30.
Bradly Sinden is also in taekwondo action at 04:34 in the men's -68kg round of 16.
Image source, Getty ImagesBradly Sinden became Britain's first male world taekwondo champion in 2019
Will Adam Peaty book a place in the 100m breaststroke final? His semi-final heat is at 03:39.
There is loads of other British interest in the pool as Max Litchfield and Aimee Willmott compete for medals at 02:30 and 03:12 respectively.
Team GB's Freya Anderson, Abbie Wood, Anna Hopkin and Lucy Hope go in the women's 4x100m freestyle relay final at 03:45.
Lizzie Deignan, who won road race cycling silver at London 2012, competes in the women's race which starts at 05:00.
Sunday's global headline acts include the world's greatest gymnast Simone Biles, four-time Grand Slam champion Naomi Osaka and the US men's basketball team.
Will this be the day Team GB clinch their first medal?
And it's already an early start for the competitors on the Tsurigasaki Surfing Beach.
Surfing is making its Olympic debut at these Games. And the conditions look ideal for the men's first round heats.
They are eight hours ahead in Tokyo so it's approaching 08:10.
Just look at those waves.
Image source, Getty Images
Image source, Getty Images
Image source, Getty Images
Image source, Getty Images#bbcolympics
How are we feeling? A little bleary eyed after an incredible Saturday? Tokyo 2020 is in full swing but steel yourself, we've got two weeks ahead of us.
As you try and stay awake on this glorious Sunday, I'm inviting you to get involved.
Text 81111, or tweet using the hashtag #bbcolympics.
We can talk about anything you like.
And just like that, the Tokyo Olympics have begun!
Image source, Getty Images
Image source, Getty Images
Image source, Getty Images
Image source, Getty Images
Image source, Getty Images