Team GB has added two gold medals to its haul at the Tokyo Olympics in new mixed male and female relay races.
At the Tokyo Aquatics Centre, the world record was broken in the 4x100m medley relay that saw Great Britain's swimmers triumph in three minutes, 37.58 seconds.
Kathleen Dawson, Adam Peaty, James Guy and Anna Hopkin finished 1.28 seconds ahead of China who took silver, with Australia getting bronze.
It comes as Team GB also won gold on Saturday in the first-ever mixed triathlon relay, while there were also bronzes in the windsurfing and boxing.
After the swimming race Team GB star Adam Peaty said: "The strategy is not about getting me pumped up, it's trying to get me pumped down.
"It sounds silly but if I see someone ahead of me I just want to go - I see red mist and I've got to get you!
"There's no point doing any of this if we're not inspiring people. That's what the Olympics is about, right? To do better and chase dreams. It's incredible to be part of that and hopefully the people back home are pumped!"
Great Britain's win in the 4x100m medley is all the more remarkable considering Dawson slipped on the wall at the start of the race.
Team GB has now secured seven medals in the swimming at Tokyo 2020 - four gold, two silver, and one bronze - matching a tally last seen at the 1908 Olympics in London.
The 4x100m medley relay is a new event at the Games - featuring teams of two women and two men.
Each athlete swims a 100m leg in one of the four strokes: backstroke, breaststroke, butterfly and freestyle.
Great Britain made a stunning comeback and when Peaty jumped into the pool, Team GB was in sixth.
The breaststroke champion pushed GB to fourth with a time of 56.78 seconds - and the team went into the lead after Guy, who won gold in the 4x200m freestyle relay earlier this week, clocked 50 seconds in the butterfly.
Hopkin completed the final freestyle leg in 52 seconds flat.
The medley relay has shaped up to be one of these most unpredictable events in the pool, with the lead continually changing.
Dawson said after the race: "I had a little bit of an issue at the start. I couldn't quite feel my hands and then somehow, I slipped when I went in - I wasn't sure what I did when I did it!
"I managed to keep calm, focus on getting the best performance out of myself I could."
The race also gave Peaty his second gold of the Games and means he now has four Olympic medals.
Eirianedd Munro, Peaty's partner, wrote on Instagram: "I'm in tears! What an incredible race. So proud!!!"
It was the second gold for Team GB in the early hours of Saturday after Jess Learmonth, Jonny Brownlee, Georgia Taylor-Brown and Alex Yee won the mixed triathlon relay.
After an excellent leg from Learmonth, Brownlee managed to break away from his rivals, delivering an advantage of nine seconds.
Taylor-Brown and Yee - who both won silver in the individual events - went third and fourth, with Yee bringing Great Britain home 14 seconds clear of the US team. France were third.
It was Jonny Brownlee's first-ever gold medal after he claimed bronze in London and silver in Rio - and it comes in his final Olympic race.
The 31-year-old joked afterwards that adding gold to his collection meant he had now "completed" the Olympics.
Since triathlons were introduced to the Olympics in 2000, Britain has won eight medals - including three golds.
Prime Minister Boris Johnson congratulated Britain's Olympians, tweeting: "Huge congratulations to .@TeamGB for their world record-breaking win in the pool and win in the triathlon mixed relay. Fantastic! "
Great Britain boxer and serving soldier Karriss Artingstall won a bronze medal despite losing her featherweight semi-final against Japan's Sena Irie.
Meanwhile, in the windsurfing RS:X, Team GB's Emma Wilson was edged into bronze by Charline Picon of France, with China's Yungxiu Lu winning gold.
The trio entered the medal race knowing they would be on the podium, but Lu needed a top-four finish to clinch the gold, with Picon crossing the line first ahead of Wilson.
Wilson, 22, from Christchurch in Dorset, said: "Those conditions were so physical, I gave it everything and I'm super happy to get that medal. I just emptied my body out there, it's amazing.
"I've come fourth so many times it means so much to finally get on the podium and to do it at the Olympics is great."
On the rugby field there was disappointment for Team GB's sevens team, as they lost their bronze medal match 21-12 to Fiji.
New Zealand beat France in the final to take the gold.