Potapova gets an early breakpublished at 23:20 British Summer Time 27 August 2019
*Potapova 6-3 1-0 Gauff
And she's done it.
Potapova manages an early break to take the first game of the second set.
Summary
American 15-year-old Coco Gauff beats Russian teenager Anastasia Potapova 3-6 6-2 6-4 in US Open first round
British number one Kyle Edmund loses 3-6 7-6 (7-1) 7-5 5-7 6-2 to Spain's Pablo Andujar in the US Open first round
Top seed and defending champion Naomi Osaka comes from behind to beat Russia's Anna Blinkova in her opener
Three-time US Open champion Rafael Nadal faces Australia's John Millman at 00:00 BST
Wimbledon champion Simona Halep beats Nicole Gibbs
Use audio icon at the top of the page for BBC Radio 5 Live Sports Extra commentary
Potapova gets an early breakpublished at 23:20 British Summer Time 27 August 2019
Postpublished at 23:19 British Summer Time 27 August 2019
Potapova 6-3 0-0 Gauff*
Two break points for Potapova now.
Postpublished at 23:19 British Summer Time 27 August 2019
Potapova 6-3 0-0 Gauff*
Leon Smith
GB Davis Cup captain on BBC Radio 5 LiveThat was a nice lob. Coco showed some good co-ordination with the backhand smash but Potapova said 'right, I've had enough of this cat and mouse game' and smashes the winner.
Postpublished at 23:18 British Summer Time 27 August 2019
Potapova 6-3 0-0 Gauff*
Gauff impresses with a drop shot, but it's met with a lob from Potapova as she takes a 30-15 lead.
Impressive forehandpublished at 23:16 British Summer Time 27 August 2019
Potapova 6-3 Gauff
Leon Smith
GB Davis Cup captain on BBC Radio 5 LiveIt's a really fascinating first set. Potapova's forehand is really impressive - she generates a lot of speed on it. It's a good first set of tennis but I expect Coco to feel her way into this match more.
Game and first set Potapovapublished at 23:15 British Summer Time 27 August 2019
Potapova 6-3 Gauff
Coco hits a forehand too hard and Potapova shouts "come on!" as the ball goes out.
First set goes to Potapova.
Postpublished at 23:13 British Summer Time 27 August 2019
*Potapova 5-3 Gauff
Potapova has three set points.
Can she take the first set?
Postpublished at 23:12 British Summer Time 27 August 2019
*Potapova 5-3 Gauff
Coco seems to be settling in now.
She eases ahead and doesn't give Potapova a chance, after the Russian overcooks it.
But it's Potapova who will serve for the opening set.
Postpublished at 23:10 British Summer Time 27 August 2019
Potapova 5-2 Gauff*
Leon Smith
GB Davis Cup captain on BBC Radio 5 LiveCoco did a good job there. It's important for her to just think about extending this first set. Get a better feel of the ball, improve her movement and find winners. She's so good that once she gets going she can rely on all sorts of play. She really has got it all.
Gauff breaks!published at 23:09 British Summer Time 27 August 2019
Potapova 5-2 Gauff*
A glimmer of hope for Gauff, and this time luck seems to be on her side!
It's 5-2 in the first set, and the crowd go wild.
Postpublished at 23:08 British Summer Time 27 August 2019
*Potapova 5-1 Gauff
Gauff brings up break point with a fizzing return. Can she capitalise? Nope. Potapova serves big and deals a one-two punch.
But the American has another break point seconds later...
Another break for Potapovapublished at 23:04 British Summer Time 27 August 2019
*Potapova 5-1 Gauff
Another break for Potapova as she serves for the set at 5-1.
Postpublished at 23:03 British Summer Time 27 August 2019
Potapova 4-1 Gauff*
Coco seems slightly deflated as she shrugs her shoulders and sighs on the baseline.
Break point Potapova.
Postpublished at 23:01 British Summer Time 27 August 2019
Potapova 4-1 Gauff*
Leon Smith
GB Davis Cup captain on BBC Radio 5 LivePotapova's feisty! You can see why she has had a good junior record and has broken into the top 100. These are two players who were playing in the junior events earlier this year - it's astonishing.
Potapova holdspublished at 23:00 British Summer Time 27 August 2019
Potapova 4-1 Gauff*
Both of these players are well and truly up for this tonight.
It's easy to forget they're just 18 and 15 years old.
Potapova extends her lead and goes 4-1 up.
Postpublished at 22:58 British Summer Time 27 August 2019
*Potapova 3-1 Gauff
Once again Coco scuppers her chances as Potapova slams a ferocious forehand winner into the corner - deuce.
Before you know it, it's advantage Potapova before Gauff challenges a call on the Russian's shot.
The cheers in the stadium show it's gone Coco's way.
Back to deuce.
Postpublished at 22:57 British Summer Time 27 August 2019
*Potapova 3-1 Gauff
The Wimbledon superstar shows her strengths with a cracking backhand return to move 30-15 up and gets two break points when Potapova double-faults.
Postpublished at 22:54 British Summer Time 27 August 2019
*Potapova 3-1 Gauff
Coco finally manages to get on the scoreboard, taking her first game with a big forehand.
It's taken her nearly 20 minutes to do it, but she's finally arrived.
Image source, ReutersPostpublished at 22:53 British Summer Time 27 August 2019
Potapova 3-0 Gauff*
Leon Smith
GB Davis Cup captain on BBC Radio 5 LiveThis is a really long journey. Coco Gauff's lighting it up now but she wants to stay here. It needs to be well managed.
Postpublished at 22:53 British Summer Time 27 August 2019
Potapova 3-0 Gauff*
Gigi Salmon
BBC TV at EastbourneI can only imagine the pressure on Coco Gauff. People want to watch her. Everyone is focusing on this 15-year-old.