Rio 2016 day 15: Mo Farah completes double double on record-breaking day for Team GB

Great Britain have ensured they will leave Rio with a bigger medal haul than London 2012, on a day when Mo Farah completed an historic double double. The 33-year-old long-distance runner retained his 5,000m Olympic title, becoming only the second man in history to win both the 10,000 and 5,000m titles in the same Games twice.

In the process, Farah matched the achievement of Lasse Viren of Finland, who completed the double at the Munich 1972 and Montreal 1976 Games. The Brit dominated the race from the mid-point and produced a 52-second last lap to cross the line ahead of the USA's Paul Chelimo.

"I can't believe it," Farah told the BBC. "My legs were a bit tired after the 10k, I don't now how I recovered. People were bringing me food in my hotel room, but it is every athletes dream.

"[It shows] I didn't just fluke it in London, to do it again is incredible. I just want to see my kids and hang this medal around their necks. I was surprised by the first lap, I thought it was going to be a slow race. They had a plan, they wanted to take the sting out of me but when I hit the front, I wasn't letting anyone past me."

Also in the Olympic Stadium, Great Britain's women claimed bronze in the 4x400m relay. The quartet of Eilidh Doyle, Anyika Onuora, Emily Diamond and Christine Ohuruogu came home in a time of three minutes 25.88 seconds to finish behind defending champions the United States and Jamaica.

For Team GB, their third-place finish gave them their first relay medal since 1992. "We have really worked hard because we thought we could medal here," Ohuruogu said. "We had to come together as a team today, we had to stick in, stay focused and keep each other's spirits up. I am so proud of them, we got a good job done today."

In the men's 4x400m relay, meanwhile, the gold went to the US in a time of 2:57.30 seconds, with Jamaica in second and the Bahamas taking the bronze.

Elsewhere on an action-packed evening, Team GB's Nicola Adams retained her boxing title in the -51kg division by defeating Sarah Ourahmoune of France. Adams, 33, edged an incredibly competitive fight by a unanimous judges' decision.

"The gold rush continues. I can't believe it I am now officially our most accomplished amateur boxer ever and it is such an amazing feeling," Adams subsequently told the BBC. "It is well up there (compared with London). They are both on the same level. It takes a lot to win an Olympic medal and I would just like to thank everybody."

In taekwondo, Bianca Walkden of Great Britain won bronze, beating Morocco's Wiam Dislam 7-1 in their +67kg bout. Walkden, 24, became the third member of Team GB to win a taekwondo medal in Rio, following Jade Jones' gold and Lutalo Muhammad's heartbreaking silver.

On the football field, hosts Brazil won their first Olympic gold medal in the competition's history thanks to a penalty shootout win over Germany. The hosts' best player and captain Neymar scored the winning spot-kick in front of a sold-out crowd at the Maracana after the match finished 1-1 after extra-time. Meanwhile, the bronze medal was won by Nigeria, who defeated Honduras.