Britain's Mo Farah is out on the track, warming up for the first heat of the men's 5,000m.

Farah has already successfully defended his 10,000m title in Rio. Can he do it all again over a shorter distance? If he qualifies, he'll go in the final at 01:30 BST on Sunday morning.

Tom Fordyce
Chief sports writer in Rio

Scorching in Estadio Olimpico as Mo Farah does his strides before the 5,000m heats. First five from each of the two heats to go through to Saturday's final, plus next five fastest losers.

BBC Breakfast presenter caught up with Charley Hull, who's in action in the women's golf this afternoon, for a few holes before she headed out to Rio.....

If you want to find out about how you can get into golf, read our special guide.

France's Thomas Simart stole a march to edge ahead of Brazilian Isaquias Queiroz dos Santos and Portugal's Helder Silva to win the men's canoe single 200m heat by 0.107 seconds. 

Hammer time.

Under way now is the men's hammer throw qualifying. Poland's Pawel Fajdek is favourite for gold. He's unbeaten in 29 competitions.

Britain's Mark Dry is 12th to throw, while compatriots Nick Miller and Chris Bennett are also involved in the second heat. 

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Great Britain's showjumpers saw their Olympic team title defence disintegrate on Tuesday, after they crashed out in round one.

However, Ben Maher and Nick Skelton all moved through to the next individual phase, with 45 riders jumping again at 14:00 BST on Wednesday. This event doubles up as the team final.

Clean rounds should see the Brits progress, but they have work to do in terms of catching the current leading medal contenders that include American Kent Farrington, Germany's Christian Ahlmann and 2008 Olympic champion Eric Lamaze of Canada. 

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A day after winning gold in sailing's Finn class, Britain's Giles Scott has been telling Hazel Irvine on BBC One all about his plans for another huge event in his diary.

"I’m off to Bermuda in November, so the next thing is the America's Cup with Sir Ben Ainslie and the guys.  

"I’m on a bit of a high and the guys while I have been away have won the latest World Series event so hopefully we can put the next 10 months together really well. It would be great to cap off an Olympic gold with an Americas Cup win."

Image source, EPA

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Great Britain’s Liam Heath and Jon Schofield have missed their first chance to book their place in the kayak double 200m final after finishing third in their heat behind the Spanish pair.

They will get another bite of the cherry in the semi-finals in a little under an hour's time.

Image source, PA

Mo Farah's quest to do the 5,000m-10,000m double (again) continues with the heats for the shorter distance today at 14:05 BST.

A second gold medal in Rio would makeFarah a nine-time global champion – a distance-running record moving him ahead of Kenenisa Bekele’s tally of eight. 

The 33-year-old Briton has won the last four global titles over 5,000m – a run which began at the 2011 World Championships. 

He's also done the 5,000m-10,000m double at London 2012 and the World Championships of 2013 and 2015.

It might not be straightforward, though. All three of the Ethiopian team, which includes 2015 World Championship bronze medallist Hagos Gebrhiwet, have clocked times within a second of Farah’s 2016 best of 12 minutes 59.29 seconds. 

The first five in each heat and the five fastest losers advance to final, which takes place at 01:30 BST on Sunday.

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Caster Semenya, 25, is largely expected to win the women's 800m (she races today at 3.02pm), which would make her the first South African woman to win gold in athletics since the end of apartheid.

She made headlines in 2008 after she was subjected to gender verification testing and was deemed "intersex".

South Africans have taken to Twitter in support of Semenya with the hashtags #Caster4Gold.

Independent Online News tweeted a poem "Caster is Mokgadi" in defence of Semenya's self-identification as female.

Semenya will be in the 800m heats from 14:55 BST

Luke Reddy
BBC Sport in Rio

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Later today we will see if Great Britain's women can secure a place in the hockey final when they meet New Zealand at 21:00 BST.

The team seem to be in an ultra focused mood. They've won every game out here. A team-wide social media ban has been imposed from the start of the tournament. They also turned down attending the opening ceremony as they didn't want to be stood up in queues for too long.

That's commitment to the cause. Hopefully tonight I can find the boyfriend of GB player Sam Quek (right). He's attending every match in a different fancy dress. He was a knight in armour with a drum last time. Another committed character it seems.

A day after winning gold in sailing's Finn class, Britain's Giles Scott has been telling Hazel Irvine on BBC1 all about his plans for another huge event in his diary.

"I’m off to Bermuda in November, so the next thing is the Americas Cup with Sir Ben Ainslie and the guys. I’m on a bit of a high and the guys while I have been away have won the latest World Series event so hopefully we can put the next 10 months together really well. It would be great to cap off an Olympic gold with an Americas Cup win."

Image source, EPA

Image source, AP

Security forces were called to the Olympic weightlifting arena after Iranian coaches reacted furiously when a lift by Behdad Salimikordasiabi in the +105kg category was ruled invalid.

The 26-year-old Iranian's left arm was deemed not to be straight on his second 245kg clean and jerk attempt.

Sajjad Anoushiravani, Iran's head coach, said there was a "conspiracy".

"It was getting ugly and we asked the competition manager to call security because of the behaviour by the Iranian officials," said Sam Coffa, chairman of the International Weightlifting Federation (IWF) technical committee.

The IWF website was unavailable after it was hacked on Wednesday by someone who plastered the homepage with Salimikordasiabi's name and photograph.

The IWF's Instagram page was also flooded with over 285,000 comments after the incident with one user writing: "Behdad is winner in our hearts. God damn the Olympics."

Jason Kenny and Laura Trott are next up on the Facebook Live train., external

Trott's favourite performance from outside of her own household was Becky James' pair of silvers.

Great Britain's Chris Mears and Jack Laugher are next up on the BBC Sport Facebook Live, external.

Jack has just revealed that when he looks over the edge of the 27m-high board that the high-divers go off at the world championships, he is paralysed by fear.

Good to hear.

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There has been some veiled scepticism from France's Le Telegramme, external regarding the British cycling team's triumph at Rio.

"Sprint is fast becoming above all a sport of strength, in which the emphasis is on muscle power - perhaps excessively so for the purists," they wrote. 

"The phenomenon affects women's events slightly less, although Britain has been able to 'manufacture' a female sprinter in barely three years. Katy Marchant, who won a bronze medal in the speed race at Rio, was still taking part in the heptathlon at the beginning of 2013."

Some media outlets quote the words of German rider Kristina Vogel, who said other countries' teams were asking themselves just how the British were managing to notch up quite so many medals.

Meanwhile, outspoken French ex-cyclist, ex-coach and now columnist Antoine Vayer has been posting a number of provocative tweets aimed at British cyclists, with the latest simply stating: "£ycling".

Ashton Eaton's record compared to the specialists... 

..pretty good.

The men's decathlon kicks off proceedings on the athletics track on day 12, from 13:30 BST.

American Ashton Eaton is bidding to become the first man since Britain's Daley Thompson in 1984 to successfully defend his Olympic title. 

Since winning in London, Eaton has also broken the world record twice and claimed two world crowns as well. 

Image source, Getty Images

Don't think energy drinks are too good for horses...

Team GB bronze medal-winner Amy Tinkler has just revealed that half of her PE GCSE was on Nile Wilson. While her team-mate is stood next to her,

"Really?" responds Wilson.

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