Bianca Andreescu beats Serena Williams 6-3 7-5 to win US Open women's singles title
Canada's Andreescu, 19, wins maiden Grand Slam title
American Williams had been aiming for record-equalling 24th Grand Slam singles title
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Earlier, Britain's Jamie Murray and Bethanie Mattek-Sands beat Chan Hao-ching and Michael Venus 6-2 6-3 in US Open mixed doubles final
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Jonathan Jurejko
BBC Sport at Flushing Meadows
Once you’re inside Ashe, you see the court has turned into a sea of American patriotism. Feels like Madison Square Garden before Apollo Creed fought Ivan Drago in Rocky IV.
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Ayo Obit: The key for Serena in this #usopen, external final will be to get to the 1st sit down break in the lead. In the last 3 GS finals she lost, she served first but was down a break or two at the 1st sit down and never really recovered mentally and ended up losing very easily.
Noel Kanyemba: Team Serena winning in two sets.
John Traynor: It will be a comfortable win for the world's greatest sportsperson.
Andreescu v Williams
Naomi Broady
British player on Radio 5 Live Sports Extra
Andreescu such a nice girl in the locker rooms. She's obviously so young. She's such an incredible girl. She certainly keeps on the right side of the cocky/confidence line.
I'm so excited I get to watch this.
Andreescu v Williams
If Bianca Andreescu wins tonight, she will become the first teenager to win a Grand Slam singles title since Maria Sharapova won the US Open in 2006.
Win and she will move up to fifth in the world rankings. Lose and she will still rise to eighth.
Andreescu v Williams
Image source, Getty ImagesWilliams says she has not thought about her controversial defeat against Naomi Osaka in last year's US Open final.
She called umpire Carlos Ramos a "thief" and a "liar" as he docked her a game amid extraordinary scenes on Arthur Ashe.
"It hasn't really crossed my mind."
Let's hope tonight is less eventful...
Andreescu v Williams
Russell Fuller
BBC tennis correspondent at Flushing Meadows
Perhaps tonight is finally the night. If Serena Williams wins here in New York, it will also be a seventh US title.
If Andreescu wins, of course it will be a surprise. No Canadian woman has won a Grand Slam in the Open era, so there's history everywhere.
#bbctennis
What is your prediction for tonight? Who is going to win and in how many sets?
Let me know via #bbctennis on Twitter.
Andreescu v Williams
Serena Williams has dropped just one set en route to tonight's final, while Bianca Andreescu has played in two three-setters.
Image source, BBC SportAndreescu v Williams
Get this...Andreescu was not even born when Williams won her first US Open (and her first Grand Slam) title in 1999.
Andreescu v Williams
But first, Williams has got to win. Standing in her way is this woman - Bianca Andreescu.
The 19-year-old Canadian is playing in her first Grand Slam final after a season in which she won titles at Indian Wells and Toronto and rose to 15th in the world.
Twelve months ago, Andreescu - then ranked outside the top 200 - lost in the first round of qualifying at Flushing Meadows.
What. A. Year.
Image source, Getty ImagesAndreescu v Williams
Image source, Getty ImagesWin tonight and Serena Williams will draw level with Margaret Court on 24 Grand Slam singles titles - the all-time record.
It will also mark her first Grand Slam title since almost losing her life giving birth to her daughter in 2017.
Andreescu v Williams
Evening! It's the last Grand Slam of the year and what a final we have in store.
It's the new kid on the block v arguably the greatest of all time. Canada v the US.
Bianca Andreescu v Serena Williams.
Ready?
Andreescu v Williams
Nine finals. Six titles. Serena Williams loves New York.
Tonight, she plays in her 10th US Open final.
History beckons.
Image source, Getty ImagesNow then.
I'm off for now, but I'll be back alongside Katie Falkingham from around 20:45 BST for the women's final, as Serena Williams hopes to clinch her 24th Grand Slam title.
See you then!
A huge congratulations to Jamie Murray and Bethanie Mattek-Sands!
Head here for JJ's match report straight from Flushing Meadows.
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Jonathan Jurejko
BBC Sport at Flushing Meadows
The best feeling in the world...
Jamie Murray and Bethanie Mattek-Sands both have grins wider than the Hudson as they lift the trophy for the second successive year on a jubilant Ashe.
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Chan/Venus 2-6 3-6 Mattek-Sands/Murray
Bethanie and Jamie are the first mixed doubles team to win back-to-back titles at Flushing Meadows since 1982, when Kevin Curren and Anne Smith successfully defended their title.
Chan/Venus 2-6 3-6 Mattek-Sands/Murray
Jamie Murray speaking on the court: “We played amazing, the whole two weeks we’ve played a lot of great tennis.
“Bethanie was so fired up today. It’s always a pleasure to play with her.
"We've had so much fun on the court. I’m really, really, really happy to win again.”
On who’s the boss: “Bethanie says I’m the ying to her yang!”
Image source, Getty Images