Duncan Scott became the first British athlete to win four medals at a single Olympic Games as Team GB claimed silver in the men’s 4x100m medley relay.
The 24-year-old anchored the team of Luke Greenbank, Adam Peaty and James Guy as they finished an agonising 0.73 seconds behind the USA.
Greenback was given the task of the first leg with his backstroke, though he would tag in Peaty with the British team lying in fifth.
It was another sensational swim from the 26-year-old, taking Team GB up to first place and putting them on track for a world-record setting time.
Caeleb Dressel fought back for the Americans in the butterfly leg, with Guy’s swim keeping Britain in touch.
Though the US pulled away from Scott in the final, front crawl leg, he still secured Team GB’s eighth medal in the swimming pool in Tokyo.
The Scottish swimmer had already picked up two other silver medals, in the men’s 200m freestyle and 200m medley, as well as a gold in the 4x200m freestyle relay.
That means he is the first Briton to win four medals at one Olympics, giving him six in total, which is only behind cyclists Bradley Wiggins, Chris Hoy and Jason Kenny.
The four golds, three silvers and one bronze medal that Team GB have collected in Tokyo have also made it the most successful Olympics in British swimming history.
It comes less than a decade after they won just three medals in London, while in Rio they took home just one gold.
But the eight of all colours that they have won here is the most won by any sport by Team GB at these Games so far.
Despite setting a British record with his four medals though, Scott revealed his disappointment with his performance in the final event.
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“I'm very fortunate to be part of some good relay teams. In 2015 when we started coming together, we would take back-to-back silvers all day,” he told BBC Sport.
“We all swam well. Slightly disappointed with mine but it's been a tough week.”
Peaty has won two of Britain’s golds at this edition of the Games, in the men’s 100m breaststroke and the 4x100m mixed medley relay.
But he added to Scott’s feelings of disappointment that the team were not able to round off the action in the pool with a final gold medal.
“I laid it all down. I knew I had to do an extremely fast time, Unfortunately, we didn't do enough to get the gold medal but sometimes you need to feel a little pain,” he told BBC Sport.
“I know these guys are disappointed and that's just an honest opinion on what we think we can do. That is the standard we are at now.
“We are not looking at bronzes or silvers we are looking how to get gold. That is my mindset. We'll take a big break and we'll use this to reflect. But we've come a long way.”