Taekwondo star Jade Jones is hoping she can add to Team GB's Olympic gold rush after the Brownlee brothers' historic triathlon triumph.
The defending champion, from north Wales, is guaranteed at least a silver medal when she fights Spain's Calvo Gomez in the women's 57kg final on Friday.
And all eyes will be on the athletics track as Usain Bolt looks to keep his hopes of an Olympic 'triple triple' alive by winning the men's 200m final, which also features Britain's Adam Gemili.
Earlier, Alistair Brownlee, 28, took gold while his brother Jonny, 26, claimed silver in a dominant performance by the pair.
After winning gold at London 2012, Alistair strolled across the line to retain his title, while his younger sibling upgraded his bronze for silver - finishing just six seconds behind.
The pair collapsed to the floor and embraced as they celebrated their achievement, which came on another golden day for Britain as moments later sailors Hannah Mills and Saskia Clark won the women's 470 event.
The older Brownlee brother, who became the first man to win consecutive Olympic triathlon titles, said the win was "very special".
He said: "The records isn't the big thing for me, it's about turning up on the day and winning the race. Maybe the enormity of it all will sink in over the next few weeks but I'm just pleased I turned up and Jonny did it as well.
"I can't remember which one of us said it, but it was very much 'we've done it'. We've trained so hard together for this and it's fantastic."
Jonny said: "In training I've maybe been a little bit better than Alistair but maybe the short stuff suits me a bit more. In the race I had a very good swim and on the bike I felt great and controlled. I might have done a bit too much work on the bike but when we got to the run Alistair was too strong for me and these hard races suit him a bit better than me.
"A bit of me thought 'here we go again' but I was confident I'd hold on to second but he got his gap and it just stayed."
Mills and Clark, who won silver in London four years ago, had to wait for their coronation after light winds postponed the final race on Wednesday but they made no mistakes on Thursday.
Mills, 28, said: "It was emotional. We bounded up the beach (afterwards). I just wanted to see my mum. She's made it out here all the way to Rio and she's been there the whole time supporting me."
Elsewhere, Liam Heath and Jon Schofield won silver in the men's kayak double 200m final.
The pair, who claimed bronze at London 2012, were pipped to the finish line by the Spanish crew by just under three-tenths of a second.
And Marcus Ellis and Chris Langridge won the country's first Olympic badminton men's doubles medal, beating China's Hong Wei and Chai Biao to take bronze.
Their medals helped bring Team GB's medal haul to 21 gold, 21 silver and 13 bronze - making 55 in total.
Team GB can also count on another medal to come, as boxer Nicola Adams guaranteed at least a silver by beating China's Ren Cancan, the opponent she beat to win gold in London 2012.
Adams, 33, goes into Saturday's women's flyweight final against France's Sarah Ourahmoune hoping to become the first to British boxer to retain an Olympic title in 92 years.
She said: "She is a good competitor but I'm hoping I'll come away with a victory in the final. I guess the crowd here like my style. I come into the ring and I'm smiling and happy and I guess that's what you want to see."