Britain's Mo Farah completed a historic Olympic distance double double with victory in the 5,000m Saturday as American runner Matt Centrowitz scored an upset win to claim the 1,500m gold.
More Mo magic
Farah became the first man since Finnish great Lasse Viren in 1976 to retain two Olympic distance titles after storming to victory, a week after defending his 10,000m crown at Rio's Olympic Stadium.
The 33-year-old Somali-born Londoner again produced a superb tactical race on Saturday to outfox his rivals and take gold in 13min 3.30sec.
"Oh my God I can't believe it!" said Farah. "My legs were tired after the 10,000m and people had to bring me food in my room. "This is the most satisfying win of the four, it is incredible. If you have dreams they can come true and I always wanted to achieve these for my kids because for so much of the year you don't see them. You want to show them something or rather the reason for the absences."
US distance surprise
Centrowitz produced the biggest upset on the final night of track competition, beating defending champion Taoufik Makhloufi of Algeria into second place to win gold in 3min 50.00sec.
Centrowitz became the first American man in more than a century to win the event, which has been shared exclusively between African runners since 1996. The last American to win the Olympics 1500m was Mel Sheppard in the 1908 London Games.
"There's nothing like it. It doesn't compare to anything else I've won in my life," said Centrowitz. "Doing my victory lap, I literally kept screaming to everyone I know 'Are you kidding me?'"
New Zealand's Nicholas Willis took the bronze medal in 3:50.24.
Topping up the table
Centrowitz's win was one of three golds won by the United States, who also took the 4x400m relays.
US track golden girl Allyson Felix led home her team in the women's 4x400m, crossing the line in 3min 19.06sec to claim a record sixth gold medal. The United States extended a stunning winning streak. They have not lost the event since 1992. Felix, who 24 hours earlier helped the USA win 4x100m relay gold, has now won more track gold medals than any other woman athlete in history.
"I can look back at the things I've accomplished and be really proud," Felix said. "It was a good night."
In the men's 4x400m, former Olympic 400m champion LaShwan Merritt led the US team home in 2:57.30 with Jamaica finishing in silver and defending champion the Bahamas bronze in 2:58.49.
South Africa's Caster Semenya completed a convincing victory in the 800m to win her first Olympic gold in 1:55.28. Francine Niyonsaba of Burundi took silver in 1:56.49 with Kenya's Margaret Wambui claiming bronze in 1:56.89.
Semenya has been at the centre of a raging controversy because of her naturally occurring condition, hyperandrogenism, which causes elevated testosterone levels. She has dominated the event since a sports court last year judged that an International Association of Athletics Federations (IAAF) regulation limiting competitive testosterone levels was unlawful.
Shortly before Saturday's final, IAAF chief Sebastian Coe said the world body would seek to revisit the question with the Court of Arbitration for Sport. Semenya would not be drawn on the controversy.
"We're not here to talk about the IAAF," she said. "We're not here to talk about speculations. "We're here to talk about the 800m that we ran today."
The other big winner Saturday was Spain's veteran high jumper Ruth Beitia, who scored the biggest win of her 20-year career with a gold.
The 37-year-old became the oldest woman to win an Olympic jumping event after clearing 1.97m. Beitia won on countback from Mirela Demireva of Bulgaria and Blanka Vlasic of Croatia.
The javelin was won by Germany's Thomas Rohler with a 90.30m throw. Kenya's reigning world champion Julius Yego won silver with 88.24m while defending Olympic champion Keshorn Walcott of Trinidad and Tobago claimed bronze with 85.83m.
Away from the track and field
Neymar sent Brazil into ecstasy as he clinched Olympic football gold.
The Barcelona star swept home a brilliant free-kick and scored a trademark stutter-run penalty to win a shoot-out against Germany as the hosts headed towards Sunday's closing ceremony on a high.
South Korea's Park In-Bee won the first women's golf Olympic gold in 116 years by a commanding five strokes, and the USA routed Spain in the women's basketball final.
Britain's Nicola Adams became the first woman to retain an Olympic boxing title in the flyweight division.
"I'm now the most accomplished British amateur boxer we've ever had, of all time, so it's a nice title to have," said Adams, 33.
Russia came to Rio under a doping scandal shadow and missing its key track and field stars.
But they snared four golds on Saturday - in women's handball, team rhythmic gymnastics, modern pentathlon and freestyle wrestling - to reach 17, fourth on the medals table.
Earlier, China's Chen Long inflicted more Olympic heartache on Lee Chong Wei with a convincing win in the men's badminton singles final -- consigning the Malaysian to his third straight silver medal.
With 294 of 306 titles decided, the United States led the medals table with with 43 golds, with Britain in surprise second place with 27 to China's 26.
Rio Olympics medals table after Saturday's events competition (gold, silver, bronze, total):
United States 43 37 36 116
Great Britain 27 22 17 66
China 26 18 26 70
Russia 17 17 19 53
Germany 17 10 14 41
Japan 12 8 21 41
France 9 17 14 40
South Korea 9 3 9 21
Australia 8 11 10 29
Italy 8 11 7 26
Netherlands 8 6 4 18
Hungary 8 3 4 15
Spain 7 3 4 14
Brazil 6 6 6 18
Jamaica 6 3 2 11
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