After a remarkable evening, it is time to bring this live text to a close.
Emma Raducanu, the 18-year-old who began her campaign in qualifying as the world number 150, is the US Open champion having stormed through the tournament without dropping a set.
The teenager is the first British woman to win a Grand Slam singles title since Virginia Wade's Wimbledon triumph in 1977, some 44 years ago. Come Monday she will be the new British number one.
She is also the first qualifier, man or woman, to ever win a Grand Slam.
It has been a life-changing few weeks for the star, who was born in Canada to a Romanian dad and Chinese mum and moved to Britain at the age of two. How lucky we are to call her our own.
I have never seen anything like that, and I am just as sure I will never seen anything like that again.
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Think we might see these two battling it out at many Grand Slams in the future. Just 18 and 19 years old...
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Raducanu and Fernandez embrace after the Briton won in straight setsImage caption: Raducanu and Fernandez embrace after the Briton won in straight sets
As well as the US Open trophy, Emma Raducanu will take home a winner's cheque of $2.5m - or £1.8m. Not bad for an 18-year-old who three months ago had never played a Grand Slam.
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Laura Robson
Former British number one on BBC Radio 5 Live
It is going to be interesting to see what route she wants to go, whether she wants to take advantage of this huge confidence she has got at the moment.
Riley Taylor: CONGRATULATIONS ON WINNING THE #USOpen2021!!!!! SO HAPPY FOR YOU!!!
Mr Higgins: Well I'll continue saying it. Emma Raducanu is a brilliant tennis player. So calm under pressure and a deserved #USOpen champion. Fantastic temperament and a superstar. Just speechless really. I love sport. Massive congratulations.
Caroline Chapman: I can’t stop crying?! @EmmaRaducanu has no idea how iconic this is.
Emma Gregory: I think this tops Leicester winning the Premier League in terms of incredible British sporting achievements.
This is something I never could have believed would happen. I think I am going to wake up. It is so unbelievable. It is flabbergasting to see this performance.
Live Reporting
Alex Bysouth
All times stated are UK
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Getty ImagesCopyright: Getty Images Raducanu and Fernandez embrace after the Briton won in straight setsImage caption: Raducanu and Fernandez embrace after the Briton won in straight sets View more on twitterView more on twitter View more on twitterView more on twitter 
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The first British female winner at Flushing Meadows since Virginia Wade in 1968
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The first qualifier in the Open era to win a Slam
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The youngest women's Slam champion since Maria Sharapova at Wimbledon in 2004
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The youngest Briton to win a Grand Slam title
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The first woman to win the US Open without dropping a set since Serena Williams in 2014
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Latest PostHere's to you, Emma...
After a remarkable evening, it is time to bring this live text to a close.
Emma Raducanu, the 18-year-old who began her campaign in qualifying as the world number 150, is the US Open champion having stormed through the tournament without dropping a set.
The teenager is the first British woman to win a Grand Slam singles title since Virginia Wade's Wimbledon triumph in 1977, some 44 years ago. Come Monday she will be the new British number one.
She is also the first qualifier, man or woman, to ever win a Grand Slam.
It has been a life-changing few weeks for the star, who was born in Canada to a Romanian dad and Chinese mum and moved to Britain at the age of two. How lucky we are to call her our own.
You can keep across all the reaction the Raducanu's remarkable victory on the BBC Sport website and why not start by checking out Amy Lofthouse's report here, see how the Queen led the celebratory messages or even check out Raducanu's best shots from the final below.
Until next time...
What a night in New York
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Russell Fuller
BBC tennis correspondent
I have never seen anything like that, and I am just as sure I will never seen anything like that again.
Post update
Think we might see these two battling it out at many Grand Slams in the future. Just 18 and 19 years old...
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From one champ to another...
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As well as the US Open trophy, Emma Raducanu will take home a winner's cheque of $2.5m - or £1.8m. Not bad for an 18-year-old who three months ago had never played a Grand Slam.
Post update
Laura Robson
Former British number one on BBC Radio 5 Live
It is going to be interesting to see what route she wants to go, whether she wants to take advantage of this huge confidence she has got at the moment.
Post update
'Highest level I have seen for some time'
Laura Robson
Former British number one on BBC Radio 5 Live
They both absolutely delivered. That is the highest level of women's tennis I have seen in a final in quite some time.
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History maker, record breaker
With this victory, Raducanu becomes:
She will also take home £1.8m in prize money, rise to 23 in the world rankings and will become the British number one on Monday.
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This tweet is from January and shows just what a remarkable rise it has been for Emma Raducanu.
A-Levels happened, you nailed them. The US Open happened, and you nailed that too.
Get Involved
#bbctennis
Riley Taylor: CONGRATULATIONS ON WINNING THE #USOpen2021!!!!! SO HAPPY FOR YOU!!!
Mr Higgins: Well I'll continue saying it. Emma Raducanu is a brilliant tennis player. So calm under pressure and a deserved #USOpen champion. Fantastic temperament and a superstar. Just speechless really. I love sport. Massive congratulations.
Caroline Chapman: I can’t stop crying?! @EmmaRaducanu has no idea how iconic this is.
Emma Gregory: I think this tops Leicester winning the Premier League in terms of incredible British sporting achievements.
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'It is so unbelievable'
Pat Cash
Former Wimbledon champion on BBC Radio 5 Live
This is something I never could have believed would happen. I think I am going to wake up. It is so unbelievable. It is flabbergasting to see this performance.
Watch the winning moment
Back where it all began!
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