BBC reporter Wyre Davies looks into why there have been so many empty seats at events in Rio.

Too expensive? Corporate sponsors not turning up? Difficult to get to? 

"It is unbelievable. You never see a minnow come here and beat a team which is supposed to be a gold medal contender. I am still shocked, to be honest."

Japan rugby sevens player Lomano Lemeki still can't believe his team's shock win over New Zealand.

Image source, Getty Images

Image source, Getty Images

With a database of over 10,000 athletes competing at the Rio Olympic Games, there are so much to discover on our Olympic body match test.

We brought you Justin Bieber and Theresa May earlier on but now it's Dwayne Johnson, aka The Rock.

It turns out the big and broad Johnson is a match to 30-year-old Brazilian water polo player Josip Vrlic.

Manchester United's Dab University, external has some prospective new students.

Zimbabwe women's team were 6-0 down to Australia when they scored a consolation to spark a remarkable flurry of the celebration.

Somewhere down there is a shark we are soaring clean over.

Image source, Twitter

It is perhaps fortunate that the men's 100m freestyle is way past the watershed at 03:00 BST Thursday morning.

Lining up alongside Britain's Duncan Scott in the race will be Canada's Santo Condorelli, whose pre-race routine involves sticking his middle finger up at his dad.

It is a rather sweet, if sweary story.

As a kid Condorelli was intimidated on the blocks as he lined up alongside bigger, broader competitors.

"I told him, ‘Enough is enough. When you get on the blocks, just put everything out of your mind and swim like there’s nobody near you," his father Joseph told swimswam.com, external in January.

"He said to me, 'How do you do that?' and I said, 'Well, you say f*** it.' So he looked at me in the crowd, and we both gave each other the finger, and he started winning race after race and we never looked back."

Image source, Getty Images

12:30 BST: Emma Pooley is in action in the women's cycling time trial.

13:00: Steve Scott starts his challenge in the men's double trap shooting.

14:00: Chris Froome and Geraint Thomas go in the men's cycling time trial.

14:22: The men's quad sculls team race in their final in the rowing.

Here's more on today's action, plus keep up to date with what's going on when and where with the BBC Sport's schedule.

Image source, Getty Images

• Siobhan-Marie O'Connor and the men's 4x200m freestyle relay team win silver medals for GB
• American Michael Phelps takes his Olympic gold medal tally to 21 with victory in 4x200m freestyle relay and 200m butterfly
• Defending champion Serena Williams, of the US, is out of the Olympics after losing to Ukrainian Elina Svitolina in the third round
• Britain's Andy Murray and Johanna Konta progress in their respective men's and women's tennis singles competition

Watch all this and more in the Olympics Playlist.

Image source, Getty Images

This Olympic body match test is ace.

British Prime Minister Theresa May has been put through the system and it turns out she matches Australian rugby sevens' Nicole Beck.

May is new to her current job but are her rugby sevens being wasted?

Find out who you match here...

Micahel Phelps, 31, and Katie Ledecky, 19, both won gold for USA last night in Brazil but this is them 10 years ago. What a photo...

Michael Phelps of the USA now has 21 gold medals after adding two more to his tally overnight.

He has won more than twice as many as anyone else in history, with the possibility of more to come at Rio 2016.

But there have been hiccups. From the Kid to the Reborn, chief sports writer Tom Fordyce on the five acts of Phelps' remarkable career.

Best pictures of day fourpublished at 10:36 British Summer Time 10 August 2016

10:36 BST 10 August 2016

Gymnastics

Image source, Getty Images

The brilliant Simone Biles, who is trying to become the first gymnast to win five medals at a single Olympic Games, helped the US seal victory in the team event.

Image source, Getty Images

Oscar-winning actor Matthew McConaughey says he is loving the atmosphere in Rio after taking time out from filming to watch the Olympics in person.

"Once the party has started you won't throw a better one than Brazil," he told BBC Radio 5 live.

You can listen to the full interview here...

Things are looking good over the Channel.

France bagged its first two gold medals of the Games with successes in the equestrian team competition and the canoe slalom courtesy of Denis Gargaud Chanut.

Image source, L'Equipe

A little less rosy on the back of the Times in the UK, which focuses on Mark Cavendish's comments to Sky Sports, external saying that Bradley Wiggins "wants to be the hero" of the team pursuit squad and suggesting he may not have left the Tour de France early had he known he would only be back-up for the event.

Image source, The Times

A big shock in the tennis overnight as defending women's singles champion Serena Williams put in an error-strewn display in losing 6-4 6-3 to Ukraine's Elina Svitolina, ranked 20th in the world.

Top seed Williams, who served five double faults in the seventh game of the second set, was left in tears afterwards and said that "the better player won".

Svitolina, who will face the Czech Republic's Petra Kvitova in the quarter-finals, said: "It's an unreal feeling for me. This is just a perfect moment."

At 34 and having lost in the women's doubles with sister Venus, you'd think Serena is unlikely to add to her tally of four Olympic medals. But this is Serena Williams we're talking about.

Her defeat means Angelique Kerber and Madison Keys are the only top-eight seeds remaining of what had appeared a very strong field. 

Image source, Getty Images

Canada's John Gordon Perrin spikes the ball as the Brazilians desperately try to block the ball, but it was the hosts who ultimately prevailed to win 3-1.

The Olympics gives athletes the chance to learn about cultures with the rest of the world. 

And nothing is as cultural as the daily visit to the little boys or girls room.

Image source, Getty Images

A bus carrying journalists between Olympic venues in Rio de Janeiro had two windows smashed - apparently by stones thrown at it - on Tuesday evening.

A few of the dozen people on board suffered minor cuts.

Lee Michaelson, a reporter on women's basketball who is also a retired US Air Force captain, believes the bus came under gunfire however.

"I know what a gun sounds like. There was a very distinctive sound of the report of a gun," she said. 

 "With my background and training, I got down on the floor as much as I could and I hollered to the others to get down."

Image source, Getty Images

If you still haven't taken our Olympic body match test, then go and try it here.

Canadian pop-sensation Justin Bieber matches Australian judoka Nathan Katz. 

Not quite sure how Justin would fare if he swapped the microphone for a black belt mind...

Image source, Google

It was day four of Rio 2016 before TV viewers in North Korea got their first look at action from the Games, BBC Monitoring reports.

The state-run Central Television station showed brief highlights from the opening game in women's football competition between Brazil and Sweden before action from the women's volleyball match between Russia and Argentina, which the rest of the world saw on Sunday. 

Then Britain's Paul Drinkhall got some air-time with coverage of his first-round table tennis victory, also from the first day of the Games. 

Bizarrely, neither match was shown to its conclusion.

Locals don't appear to have been told of the country's successes so far – two silvers in weightlifting – but yesterday's main news bulletin kept them fully up-to-date with advances in mushroom farming and third anniversary reminiscences of leader Kim Jong-un's visit to Pyongyang's spectacular Water Park.

Image source, .