Women's 200m Freestyle Final
Men's 200m Butterfly Final
Women's 200m Individual Medley Final
Men's 4 x 200m Freestyle Relay Final
Northern Irishman Alan Campbell will be hoping for success in today's quarter-finals in the men's single sculls.
Earlier he spoke to BBC Radio Berkshire's Tim Dellor about being the only Northern Irish competitor to appear in four Olympic games, and how proud he is to represent his country.
Rowing
Image source, APFirst up on the water today for Great Britain is Northern Ireland's Alan Campbell. A bronze medallist at London 2012, he goes in the fourth and final quarter-final of the single sculls.
New Zealand's Mahe Drysdale and Czech Ondrej Synek are the two favourites for the class and have already slugged it out side by side in the second heat.
Drysdale came through to overhaul Synek in a victory that James Cracknell in commentary reckons that the way the Czech folded might have psychologically cost him any chance of a gold medal.
Gymnastics
Gymnast Nile Wilson has posted his thoughts on Instagram after a hard fought Men's Team final on Monday evening. The GB lads finished fourth, missing out on a medal by two marks.
"We gave it our all last night & all the heart in the world! Gymnastics is gymnastics & I'm so proud to be a part of this incredible team & achieving 4th place at the Olympic Games!... Thank you so much for everyone's support it means so much ❤️ On to the next!"
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And the "next" for Nile are the all around and high bar finals in a few days time...
Iconic celebrations of Games past: Kelly Holmes' eye-bulging disbelief, the Mobot, the Lightinging Bolt...
...probably not the Sun Yang hat fling.
BBC Sport's Equestrian commentary team are up early and getting ready for the Eventing starting at 13:00 using the player at the top of this page.
Get involved using #bbcrio2016
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#QuidditchforTokyo2020
Lots of live action to watch shortly, including equestrian, fencing, Konta and Murray in singles tennis action (16:00BST) and in less than five minutes time Team GB compete in men's and women's rowing semi-finals.
Image source, BBC Sport
Image source, BBC SportBoxing
Yesterday, GB's Galal Yafai lost out in the second round of the men's light flyweight competition.
"I have to be pleased with it. I was working at Land Rover, fixing cars, and now I just lost to the world champion in the Olympic Games."
Yafai puts a brave face on losing to Cuba's world champion Joahnys Argilago.
Table Tennis
Britain's Paul Drinkhall became only the third Briton to make the last 16 at the Olympics but he narrowly missed out on reaching the quarter-finals after being beaten 4-2 by Belarusian Vladimir Samsonov.
The Belarusian won the opening three games before Drinkhall, who saved eight match points, won the fourth 17-15.
He threatened a remarkable comeback with a 11-7 win in the fifth game, but Samsonov won 11-8 in the sixth.
"I let it slip a little bit but I didn't do that much wrong," said Drinkhall.
Rowing
There's loads happening at the Lagoa on day four at Rio 2016, starting from 12:30 BST.
First up is the men's single sculls, with Britain's Alan Campbell going in the last quarter-final race at (13:00). The women's race follows.
The men's pairs semi-finals start at 13:50, with Brits Alan Sinclair and Stewart Innes going in the second semi, up against favourites Hamish Bond and Eric Murray from New Zealand.
London 2012 gold medalist Katherine Grainger and Vicky Thornley go in the second women's double scull semi-finals at 14:20, followed by the men from 14:30.
The lightweight fours semi-finals start with the men's races at 14:50, featuring GB's quartet of Chris Bartley, Mark Aldred, Jono Clegg and Peter Chambers.
Defending champion Kat Copeland and partner Charlotte Taylor go in the lightweight women's repechage at 15:20.
For the full schedule, click here.
Image source, Getty Images
Image source, ReutersWhat's on the Rio menu today?
For starters, Katherine Grainger - competing in her fifth Olympics - and Vicky Thornley are in action in the double sculls semi-final at 14:20 BST.
For mains, how about a bit of David Florence in C1 canoe slalom semi-final action at 17:30 BST.
And to round it off Great Britain in what is sure to be an eye-popping women's team final in the gymnastics from 20:00 BST.
This is very much an a la carte affair though. Check out our day-by-day guide and complete schedule to navigate your own way around Rio.
BBC Monitoring
News from elsewhere
Image source, ReutersRussian state-owned rolling news channel Rossiya 24 has broadcast an "expose" on the use of cupping therapy amongst US Olympic athletes, comparing the practice to the use of meldonium, a banned substance whose widespread use in Russia led to a number of Russian athletes being banned from competing in this year's games.
The report, headlined "like meldonium, only legal" and broadcast on the evening of 8 August, focused on the use of the ancient Chinese suction-based massage technique by 19-time gold medallist Michael Phelps and his teammates.
According to the channel's correspondent, Phelps "owes much of his success to vacuum massage". The practice, he continued, "improves blood circulation and metabolism, which means that muscles recover faster after physical exercise. So its effects are very similar to those of meldonium".
It's all totally above board, by the way. More on the practice here.
#GetInspired
BBC Breakfast have been at the British Showjumping National Championships, external this morning and caught up with some potential stars of the future.....
Breakfast's Holly Hamilton talks to Jessica at Stoneleigh Park
If you want to find out more about getting into equestrian sports, read our special guide.
Equestrian
"You walk the course so many times, you make so many plans and then you go out and fall over."
New Zealand's Tim Price on how even the best laid plans can come a cropper after a fall during his ride in the cross country.
(Maybe it was the leopard hiding in the log that scared Tim's horse)
Image source, Getty ImagesRowing
That's one for the fridge door...
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...followed shortly by the bin
We all do it.
Perfectly in sync. Even their hair.
A cracking shot of Britain's Tom Daley and Dan Goodfellow from their bronze medal-winning 10m syncro routine.
Image source, Getty ImagesGet involved - #bbcrio2016
Image source, Getty ImagesWell he didn't look happy to be there in the Aquatic Centre on Monday evening but remember the name, not that you could forget it, Boomer Phelps...
Yes, that little fella in the adorable ear defenders is the offspring of 19 time Olympic Champion, Michael Phelps...
(and his partner, Nicole Johnson - she helped).
Image source, Getty Images
Image source, Getty Images
Chris McLaughlin
BBC Sport Scotland
Rio 2016 organisers say almost 80% of all available tickets have now been sold for the games but they admit TV pictures showing huge amounts of empty seats inside the venues is a problem.
Billboards of Usain Bolt urging Brazilians to buy tickets have started appearing inside some arenas. Organisers also say they are cracking down on tickets touts with around 40 detained inside the Olympic Park on Monday.
Image source, Getty ImagesNo prizes for spotting Dream Team figurehead Michael Jordan in the back row.
Not even a cuddly toy for naming former US president Bill Clinton in the front row.
The speedboat and colour television for spotting a toddling Katie Ledecky in the front row though.
As ESPN explain, external, Rio's 400m freestyle champion and America's golden girl in the pool was just two years old when Jordan bought a stake in the Washington Wizards.
Her father was a part-owner of the city's Capital's ice hockey team so took her along to the big game.
Reddit user Sam Fisher, external has tracked down a photo of his royal Airness carrying Ledecky junior around in the executive box behind the scenes.
Image source, SamFisher83