Charlotte Dujardin wins dressage bronze to become Britain's most-decorated female Olympian with six medals
Swimming: GB men win superb 4x200m freestyle relay gold - second gold for Tom Dean
Rowing: GB win men’s quadruple sculls silver as coxless four miss out on medal
Four-time Olympic champion gymnast Simone Biles withdraws from Thursday's all-around
GB's James Hall eighth and Joe Fraser ninth in all-round final
GB men lose rugby sevens bronze match to Argentina; Fiji beat All Blacks in final
Boxing: GB's Karriss Artingstall guaranteed bronze after reaching women's featherweight semi-finals
Tennis: Andy Murray & Joe Salisbury lose in doubles & Liam Broady out of singles
Women's singles group stage
Image source, Getty ImagesKirsty Gilmour's Olympic run comes to an end.
The 27-year-old Scot defended well against Akane Yamaguchi, but an advance to the knockout stages was not to be.
The Japanese fourth seed is through thanks to a 21-9 21-18 victory.
Men's double sculls
Garry Herbert
Olympic gold medal winning cox on BBC TV
Great Britain were brave in the middle thousand but they just didn't have enough.
They were just on the back foot and you can't afford to do that in the final.
Men's double sculls
Graeme Thomas and John Collins have popped. China, the reigning world champs take bronze.
Netherlands take silver. The French take gold.
Hugo Boucheron and Matthieu Androdias repeat their success from the 2018 World Rowing Championships.
Men's double sculls
Graeme Thomas and John Collins are making ground on the Chinese boat. Can they get a medal...250m to go.
Men's double sculls
C'mon lads. Graeme Thomas and John Collins are about half a length off a bronze. One big push needed.
Men's double sculls
Garry Herbert
Olympic gold medal winning cox on BBC TV
The Chinese, Dutch and French are just starting to edge with GB in fourth place at the half way point
Men's double sculls
Graeme Thomas and John Collins are in lane five. The British pair have made a good start but a gap between them and the leading three crews is just starting to develop.
Women's singles group stage
A great start to the second game for Kirsty Gilmour - but 5ft 1in Yamaguchi packs a punch.
The Japanese 24-year-old is able to move Gilmour around the court, but the two-time European Championship silver medallist is keeping up with some great defensive play.
Gilmour's coach is telling her to just keep things simple...
Men's double sculls
Garry Herbert
Olympic gold medal winning cox on BBC TV
Whisper it... there is an outside chance of a medal for Graeme Thomas & John Collins but they will have to work hard for it
Men's double sculls
Graeme Thomas and John Collins are off. Come on lads.
Women's double sculls
Superb performance from Ancuta Bodnar and Simona Radis for Romania.
Image source, BBC Sport
Another of the big stories from day four revolved around American gymnast Simone Biles.
Biles was praised for prioritising "mental wellness over all else" after pulling out of the Olympic women's team final.
The head of the US Olympic team, many gymnasts, and other sportspeople were among those to praise Biles' decision.
The 24-year-old withdrew from the event after her vault, saying: "I have to focus on my mental health."
"You've made us so proud," said Sarah Hirshland, chief executive of the US Olympic and Paralympic Committee.
"We applaud your decision to prioritise your mental wellness over all else and offer you the full support and resources of our Team USA community as you navigate the journey ahead."
Women's singles group stage
First strike goes to Japan.
After a shaky start fourth seed Akane Yamaguchi has taken the opening game 21-9.
Kirsty Glimour has got a match on her hands at the Musashino Forest Sport Plaza...
Women's double sculls
The final of the women's double sculls has just got under way.
No British boat in this one. Garry Herbert and James Cracknell on comms.
Men's double sculls: Graeme Thomas & John Collins (01:30).
Women's four: Rowan McKellar, Harriet Taylor, Karen Bennett & Rebecca Shorten (01:50)
Men's coxless four: Sholto Carnegie, Oliver Cook, Rory Gibbs & Matthew Rossiter (02:10).
Men's quadruple sculls: Harry Leask, Angus Groom, Tom Barras & Jack Beaumont (02:30).
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Women's singles group stage
Tricky first opening game for Kirsty Gilmour.
The Scot raced into an early 4-0 lead but now Japanese opponent Akane Yamaguchi is dictating the pace of the rallies.
Currently 14-8 to Yamaguchi.
It wasn't the taekwondo gold that Bianca Walkden had hoped for but the 29-year-old says it was a "massive honour" to secure another Olympic medal for herself and Team GB.
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Women's singles group stage
Image source, ReutersGB badminton action incoming from the Musashino Forest Sport Plaza.
Kirsty Gilmour opened with a comfortable win in the group stage, seeing off Pakistan's Mahoor Shahzad 21-14 21-14.
The Scot, who competed for Team GB at the Rio Olympics in 2016, faces a tough match against Akane Yamaguchi of Japan.
A win for the two-time European Championship silver medallist would see her into the knockout stage – but defeat would see her Tokyo Games come to an end.
One of the highlights of the Games on day four was the one-two finish for Tom Dean and Duncan Scott of Team GB in the men's 200m freestyle.
But the reaction of Dean's friends and family as he swam to gold was priceless.
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It's another gold and two silvers as Team GB make their best start at an Olympics. In the pool Tom Dean clinches gold in the 200m freestyle with compatriot Duncan Scott taking silver.
Team GB’s triathlon team secure another silver as Georgia Taylor-Brown fights back from a puncture in the women’s triathlon. GB’s women’s gymnastics team take bronze as does Bianca Walkden in the Taekwondo +67kg.
And Britain’s dressage team claiming bronze. Listen to this audio feast from day four.