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
Click on the button at top of page to listen to BBC Radio 5 Live commentary
Chan/Venus 2-1 Mattek-Sands/Murray*
Michael Venus challenges a call on the baseline, convinced Mattek-Sands' shot was out. It was.
It's back to 15-30, though, after the top seeds hit back-to-back forehands too long.
Chan/Venus 2-1 Mattek-Sands/Murray*
No sweat.
A backhand-volley error from their opponents gives Chan and Venus a narrow 2-1 lead.
*Chan/Venus 1-1 Mattek-Sands/Murray
Chan and Venus' second service game doesn't exactly go to plan, as Murray and Mattek-Sands produce a forehand volley to go 30-0 up.
But Murray hits the next shot into the net, and the top seeds are back to 30-30 after a forehand volley winner.
*Chan/Venus 1-1 Mattek-Sands/Murray
Roles reversed now, as the American and Brit bring it back to one game apiece.
Chan/Venus 1-0 Mattek-Sands/Murray*
A dominant start from the top seeds, as they win their first service game.
A couple of forced and unforced errors from Murray and Mattek-Sands mean they're serving next to level things up.
Chan/Venus v Mattek-Sands/Murray
Here we go!
Play.
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Image source, Getty ImagesMurray and Mattek-Sands won here in 2018, beating Poland's Alicja Rosolska and Croat Nikola Mektic on a match tie-break 2-6 6-3 11-9.
It was Mattek-Sands' eighth Slam title but her first since a career-threatening knee injury at Wimbledon in 2017.
Their opponents today are top-seeds Chan Hao-ching, of Chinese Tapei, and New Zealander Michael Venus.
They haven't dropped a set on their way to the final.
No pressure.
Image source, Getty Images
Image source, BBC SportThe US Open has been a successful tournament for me in recent years and I'm hoping I can win another trophy when I play with Bethanie Mattek-Sands in the mixed doubles final on Saturday.
Bethanie and I won the competition here last year, which meant I defended the title after winning it with Martina Hingis two years ago.
I also won the men's doubles with Bruno Soares in 2016 after we reached the final in 2015 as well.
So I've had some decent success here and means I'm looking to win a trophy for the fourth successive year when Bethanie and I play Chan Hao-ching and Michael Venus, who are the top seeds, in the mixed final.
I like the conditions at Flushing Meadows, it suits my game and I've had some great partners along the way.
Generally I like playing in North America - I like the tournaments, I like the conditions, I like the crowds - so I feel like I'm always in good shape when I come to New York for the final Slam of the season.
Read Jamie Murray's full BBC Sport column here.
Jamie Murray's recent dominance in the Big Apple means he's lifted a doubles title every year at Flushing Meadows since 2016.
He won the men's doubles with Bruno Soares in 2016 and the mixed doubles in 2017 with Martina Hingis and in 2018 with today's partner, American Bethanie Mattek-Sands.
Can he add to his tally today on Arthur Ashe?
Image source, Getty ImagesWelcome to the penultimate day of action at Flushing Meadows.
Before tonight's showcase women's final, I'll be bringing you live text commentary of the mixed doubles final.
Britain's Jamie Murray is bidding for his fourth US Open title in four years.
Image source, Getty Images