AFP/Rio de Janeiro
Usain Bolt won his second gold medal of the Rio Olympics, brushing aside all-comers again in his favourite 200m sprint but failing in his bid to smash his own world record.
The Jamaican triumphed as Britain's Brownlee brothers dominated in triathlon to keep their country ahead of China in the medals race.
Meanwhile, an Iranian woman finally won an Olympic medal.
The 29-year Bolt timed 19.78sec to easily beat Canadian Andre de Grasse into second and France's Christophe Lemaitre into third, both of whom failed to get under 20sec.
Before the race Bolt had said he would go for his world record of 19.19sec.
Bolt said it was "a brilliant feeling" to win but he was not happy with his time and indicated he may not run the 200m at the world championships next year in London.
"I wasn't happy with the time, my body just wouldn't respond in the straight. I'm getting older and my body is ageing.
"Personally I think this is my last 200 but my coach may beg to differ."
Usain Bolt leads the pack in the men's 200m final.
He also insisted he belonged in the pantheon of all sports legends.
"I am trying to be one of the greatest...to be among Ali and Pele. I hope after these Games I will be in that bracket."
A triumph in Friday's 4x100m relay with Jamaica would give him a 'triple triple' -- third straight sweep of the sprint golds -- to bid farewell to the Olympics.
The reigning US 4x100m women's relay champions ran alone on the track to get a place in the final after being given a reprieve by the IAAF.
They were left facing disqualification after a dropped baton exchange between Allyson Felix and English Gardner.
Judges ruled Felix had been knocked off-balance by Brazilian runner Kauiza Venancio and allowed a race against the clock.
The Americans managed it, got the fastest time and forced China out of the final.
Trinidad-born American Kerron Clement won the men's 400m hurdles gold, clocking 47.73sec to hold off a furious late challenge from Kenya's Boniface Tumuti. Turkey's Cuban-born Yasmani Copello claimed bronze.
Dalilah Muhammad became the first US winner in the women's 400m hurdles. The fastest woman in the world this year over the distance, blasted out of the blocks and held on to a commanding lead for a deserved gold in 53.13sec.
Sara Slott Petersen of Denmark took silver while Muhammad's team-mate Ashley Spencer claimed bronze.
Defending champion and world record holder Ashton Eaton won the decathlon title, matching Briton Daley Thompson who won twice in 1980 and 1984.
"One day, I'm going to have to meet Daley, shake his hand and thank him for giving me something to chase after," said Eaton.
The other American gold came in the shot put, where Ryan Crouser won with a best of 22.52 metres, a new Olympic record.
On Copacabana beach, Alistair and Jonny Brownlee became the first British brothers to win Olympic gold and silver when they blitzed the field in the men's triathlon.
"When we crossed that finish line I was pretty emotional. 'We've done it!' I said to Alistair, because we had done it," declared Jonny.
History was made in the taekwondo with a first medal ever for Jordan, while Kimia Alizadeh claimed a first medal for an Iranian woman.
Britain's Jade Jones beat Spain's Eva Caldo 16-7 in the women's under 57kg final.
But there was as much attention on the bronze match where Alizadeh beat Sweden's Nikita Glasnovic 5-1.
"I am so happy for Iranian girls because it is the first medal and I hope at the next Olympics we will get a gold," said Alizadeh.
Jordan's Ahmad Abughaush Abughaush beat Alexey Denisenko of Russia 10-6 to win the men's under-68kg division.
In women's golf, back on the Olympic agenda for the first time in 116 years, South Korea's Park In-Bee has a one shot lead over American Stacy Lewis at the midway point.
Japanese duo Misaki Matsutomo and Ayaka Takahashi claimed badminton women's doubles gold.
Elsewhere hosts Brazil, New Zealand and Britain won sailing golds; Spain, Ukraine, Hungary and Germany took the canoe and kayak titles on offer.
And Cuba's three-time amateur world champion boxer Julio Cesar La Cruz bamboozled Kazakhstan's Adilbek Niyazymbetov to win the light-heavyweight title.
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