Team GB's quartets have made history and matched records in the triathlon and swimming, claiming gold in both events.
In the pool, Great Britain equalled their best swimming medal haul (set in 1908) at an Olympics after winning the inaugural mixed 4×100 metres medley relay final in a new world record time at the Tokyo Aquatics Centre.
It was the second team medal for Great Britain in the early hours of Saturday after Jess Learmonth, Jonny Brownlee, Georgia Taylor-Brown and Alex Yee helped Team GB to first place in the inaugural mixed triathlon relay.
The two podium finishes bring GB's overall medal count to 27 (8 golds, 9 silvers and 10 bronzes).
Emma Wilson added a bronze medal to the total in the women’s windsurfer RS:X event on Saturday.
'I'm really proud of us' - Hopkin and Dawson speak of the legacy they hope to have
Gold in the pool means GB's swimmers have matched their tally in the water from London 1908.
Adam Peaty, Kathleen Dawson, James Guy and Anna Hopkin came in home ahead of China and Australia.
It was Peaty’s second gold, having won the 100m breaststroke earlier in the week, while the country has seven medals at the Aquatics Centre.
"We're really strong in this sport and we're just going to get stronger," Hopkins said afterwards - claiming gold at her first Olympics.
Of Peaty she said: "He's our secret weapon in a way. When he's behind he just wants to chase, he wants to catch, and that gives us so much motivation not to lose that lead.
"It's a real inspiration to be able to train beside him and win a gold medal with him as well."
"I think it will give girls all around who are swimming that motivation, and hopefully by Paris there'll be a lot more girls medalling," she added.
Teammate Dawson echoed that wish to inspire.
"It's definitely worth it to have that inspiration for the next generation as well. It's amazing just to see us girls come through, especially here, in what was such a male dominated sport.
"I'm really proud of us and hopefully that's an inspiration for the next generation of female swimmers who are coming through".
'They were up at 5am in the morning, on the champagne already'
Both told ITV News their friends and family were watching at home.
"They were up at 5am in the morning, on the champagne already," said Dawson.
"I don't think they'll be getting much sleep - they were up and excited," Hopkins added.
"Everyone back home is so committed to watching us even though it's 3am in the morning and they're all so supported.
"It's a shame they can't be here to watch us, but we feel the support from back home."
James Guy's father Andrew was watching at home with the rest of the family, "we sobbed" he told ITV News.
"It's 20 years in the making, lots of highs and lots of lows and when you're a swimmer it's a journey for the family.
"And not being out there, we've been to every event, but not to this event. [...] and that was another reason you saw James cry - there were lots of emotions there.
"That's the first event we've never been at, ever".
In the inaugural mixed triathlon event Team GB's quartet roared to success once more.
After an excellent first leg from Learmonth, Brownlee broke away from his rivals, and individual silver medallists Georgia Taylor-Brown and Alex Yee maintained the advantage to claim Britain’s seventh gold of the Games.
This is one of a number of mixed events introduced to the programme in Tokyo, although it was added to the Commonwealth Games back in 2014, when Britain triumphed.
For Brownlee, it was the only colour of medal missing from his collection having won silver and bronze in the triathlon at the last two Games.
He told ITV News being Olympic champion "caps it off amazingly" but said his bronze at London 2012 remains his favourite piece of silverware.
'Nothing will ever compete with a home Olympics, my first Olympics'
"Being Olympic champion, completing the set, caps it off amazingly - but to be honest with you I still think my favourite is the London bronze.
"Nothing will ever compete with a home Olympics, my first Olympics, the pressure that went into that.
"I couldn't cross the road at home without someone saying 'good luck' I couldn't go to the local bakery without someone buying me my lunch - which is absolutely brilliant being a Yorkshireman."
Brownlee claimed bronze in London nine years ago and silver in Rio behind his brother Alistair - he said it had "been strange" competing at an Olympics without Alistair.
Sibling rivalry stays strong between the Brownlee brothers as one congratulates the other on making Olympic history
"It has been strange not having Alistair there - more so in the build up than the actual race. But to be honest with you, this Olympics has been strange in so many different ways this is just another one of those different, strange ways.
"But I have seen him, he's here. After my leg [in the mixed relay] he said 'absolutely brilliant, you're the best second leg athlete in the world so you couldn't have done anymore'.
"And then he text me saying 'well done Olympic champion, you've made history being the first triathlete to win three Olympic medals - but his two medals still count more.'"
Darryl Taylor, father of Taylor-Brown and a former middle-distance runner for England, posted a picture on Instagram of the team welcoming Yee over the line captioned “What a race by team GB”.
He told ITV News he was a "super proud dad".
"For me, I'm just overflowing with joy and happiness for her and, as you can see, a big cheesy grin off me as well - they're my emotions.
"Proud, proud as you can get."
The win means GB finished top of the medal table for the triathlon, with their gold in the team and two silvers in the men’s and women’s races for Yee and Taylor-Brown respectively.
A quarter of a century after her mother came up agonisingly short in her final Olympic regatta, Emma Wilson confirmed a windsurfing bronze medal for Great Britain in Enoshima.
Wilson had gone into the final day of competition secure in the knowledge that she had already secured an Olympic medal.
Picon got off to a flying start for France and although the Briton made some progress, she could not catch her rival who streaked across the finish line.
China’s Lu Yunxiu took home the gold.
"My mum told me just to enjoy it, because she didn’t," said Wilson. "She had a lot of pressure as the triple world champion leading into it, and that’s always going to be hard."