Australian Jarrod Poort has gone out hard in the opening minutes of the open-water swimming.

Very hard. He has opened up around 50m worth of clear blue water on the rest. But surely he is going to pay for the pace?

These were his own words to the Sydney Morning Herald in January.

"Drafting is a very big part of the sport. It's a very big saving, sitting behind someone and letting them do the work," he said., external

"One of the biggest things that any open water swimmer learns is that the bloke behind you is doing it even easier."

James Peat: How about Greco Roman wrestling - does anyone really understand it???

Dave W: Football has a maximum age restriction which doesn't seem compatible with the Olympic ideal. The World Cup is sufficient.

George Hardy: We need high profile sports like tennis in the Olympics. Love it when well paid athletes do their best in a tournament with no prize money.

Nick Hope
BBC Sport in Rio

Can Jack Burnell become GB's first-ever open water marathon swimming Olympic champion?

The conditions are calm and almost pool-like, but much like for team-mate Keri-anne Payne (who was seventh yesterday), this isn't what he would have wanted.

Both Burnell and Payne like rough seas as the waves help separate the 'pool' swimmers from seasoned open water specialists.

That said, Burnell is the master tactician. Fifth at last year's world championships - he maiden senior event - has been followed up by World Cup successes.

Great Britain's Jack Burnell was the first British athlete to qualify directly for the 2016 Rio Olympics when he finished fifth at the World Championships last year.

The 23-year-old goes in the men's open water 10km swim.  

He has won two gold medals, plus a pair of silvers, in the 2015 and 2016 Fina World Cup and he starts his quest for a medal right about... now!

Image source, Getty Images

BBC Monitoring
News from around the globe

The southern Russian republic of Ingushetia has given a fanfare greeting to Ingush athlete Khasan Khalmurzaev, who won gold in the men's 81 kg judo contest. Ingush leader Yunus-Bek Yevkurov said in an Instagram post on 15 August that "he was overwhelmed with pride" as he was greeting Khalmurzaev and his coach. Yevkurov posted a picture showing the athlete and several men standing out of the car rooftop in a motorcade. As you do.

Andrew Woodroffe: What did the BBC even show on TV before the Olympics?!

What did we ALL even do Andrew....? 

Who am I? What is my purpose? Where do I go from here?

Phil Newbery: I would lose half of the swimming races. Too many medals for one sport.

Jono Kibble: Surely the sport to drop is basketball....kinda pointless when anything less than 2 x US gold is a major shock!

Phil Hancey: Who needs two versions of volleyball? Get rid of one. And put squash in - travesty!

tweetSP0RT: Lose all the events that are solely judged. Dressage, gymnastics,diving etc. along with football golf and tennis. 

We said one-in-one-out... Not-one-in-six-out you lot.

"I always do that. That is not an accident. I started doing it a long time ago. If I am in a fight I will always put myself first. I did it in China at the world championships and I broke my ribs. People tell me not to but I will do it. It comes from the heart. I am in my home Olympics."

Brazil's sprinter Joao Vitor de Oliveira on his dive over the line in his 110m heat.

Image source, Reuters

MATHIUS J: I think that any sport that already has a large global presence in it's own right should go such as football, tennis and golf.  

Alex Riddell: While I am unsure what to remove I find it staggering that squash is repeatedly looked over for a spot at the Olympics.

Sarah Donnelly: This is going to be controversial but in a one-in-one-out situation I could do without Dressage. It seems more horse less human.

Keep your suggestions coming in using #bbcrio2016. We love it when you give a good reason too. 

(Not as good reasons include but are not limited to "because Great Britain aren't that good at it")

Image source, AP

British Cycling's obsession with preparation, planning and marginal gains extended as far as the waxing parlour it turns out.

The Guardian report, external that the nation's top track cyclists were told to keep things downstairs as untended as possible to help prevent saddle sores.

“It was a tricky one to broach but we knew that we had to try to persuade the girls to stop shaving and waxing if we were going to sort out the saddle pain we knew all of them were suffering with," said Phil Burt, British Cycling’s long-time physiotherapist. 

Image source, Getty

Skateboarding, surfing, climbing, karate and baseball/softball are joining the Olympic programme for Tokyo 2020.

But if the Olympics worked like a nightclub in freshers' week with a one-in-one-out policy, which sport would you most like to see hooked from the current selection?

Send us your thoughts via #bbcrio2016, external on Twitter via the BBC Sport Facebook page, external and 81111 on text.

Image source, EPA

Two years ago at the winter games in Sochi, according to a report commissioned by the World Anti-Doping Agency, Russian secret service agents would pose as sewer engineers to gain access to the building containing the urine samples of athletes.

Then would the use secret "mouse hole" corridors to gain access to the laboratory itself and swap samples containing illegal substances with clean undoped urine.

At Rio, IOC medical chief Richard Budgett is taking no chances.

“There is security presence from the national guard, private security at the lab, an extensive network of surveillance cameras," he said.

"I get the footage of the door of the freezer and there is a guard by the freezer. People can only enter the room in pairs and there is a log of who comes and goes.”  

Image source, Getty Images

Team GB's position above China in the Olympic medal table has led some to heap praise on former Prime Minister John Major (pictured above, watching track cycling at London 2012), whose government took the decision to launch the National Lottery in 1994. 

The lottery has poured millions into sport in the UK, but can it claim credit for medal success?

BBC News Magazine examines the evidence here.

Shelly-Ann Fraser-Pryce showed off her 100m bronze medal on her Instagram on Monday.

She is used to a different colour medal but was proud to accept third place behind her compatriot Elaine Thompson and USA's Tori Bowie who took the silver. 

"You can't always be STRONG, but you can be BRAVE!!!"

Image source, Getty Images

Determination on the face of USA's Kami Craig as she battles to get to the ball ahead of Brazil's Diana Abla at the water polo.

Image source, Rex Features

What is it like to ride the high of winning a gold medal in Rio?

British four stroke seat Constantine Louloudis has written a great account for the Times, , externalwhich features him waking up hungover and thinking he had lost his medal.

"I am absolutely buzzing and wired by everything that has happened over past 36 hours and can’t bear the thought of turning in for a prolonged kip," he writes.

"Why do that when I can go to the Olympic Stadium and see the final of the men’s 100m? 

"You can sleep when you’re dead. Or just not when you’re feeling quite this alive."