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
And that's your lot from Flushing Meadows!
Join us tomorrow from 16:00 BST with live text updates and BBC Radio 5 Live commentary with British action as Dan Evans takes on Lucas Pouille and Johanna Konta faces Margarita Gasparyan.
Here's a round-up of the best content from day two.
Kyle Edmund loses in five sets to Pablo Andujar in first round
Naomi Osaka survives scare, Simona Halep & Petra Kvitova advance
Dominic Thiem & Stefanos Tsitsipas knocked out in first round
Meanwhile, head here for all the live scores as we head into the evening session.
Image source, Getty ImagesMeanwhile, Rafael Nadal is currently leading 5-2 in the first set of his first round opener against Australian John Millman.
Image source, BBC SportThird seed Karolina Pliskova is among the favourites to win the women's singles at the US Open and started her bid for a first Grand Slam victory with a straight-set win over fellow Czech Tereza Martincova.
In her latest BBC Sport column, she explains why it wasn't a perfect win, how she deals with pre-match nerves, why she watches opponents on YouTube and how husband Michal did not like watching Pretty Woman on Broadway.
"I am aware I am the only active player who has been the world number one and not won a Grand Slam title - but it is not something I'm always thinking about."
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Next up... Coco Gauff will face Hungary's Tímea Babos in the second round.
Potapova 6-3 2-6 4-6 Gauff
Coco Gauff speaking on court: "Honestly. it's because of the crowd You guys were amazing. No matter where I was on the court, I could always hear someone supporting me and I'm really grateful for that.
"This is my frst match in Louis Armstrong and the crowd is amazing. I hope I'm back on this court with similar fans. Thank you guys so much."
Image source, Getty ImagesPotapova 6-3 2-6 4-6 Gauff
Coco Gauff speaking after the win: "I wanted to win and I was trying to calm myself down. The crowd really helped me. I was almost out.
"I think I gave my family a heart attack, especially my mom. My dad looks a little bit tired over there too!
"Eat, sleep, recover and then get ready. Do I play tomorrow? [She's told she isn't playing until Thursday] I'm so used to the juniors. I forgot about the day off thing!"
Image source, Getty ImagesPotapova 6-3 2-6 4-6 Gauff
Leon Smith
GB Davis Cup captain on BBC Radio 5 Live
She is exciting to watch and plays a great brand of tennis. It's brilliant scenes in her box. It's great sportsmanship too as she claps off Potapova. It's obvious who the star of the show is.
Potapova 6-3 2-6 4-6 Gauff
The 15-year-old has done it again!
She's through to the second round on home soil!
Coco Gauff. Remember the name.
*Potapova 6-3 2-6 4-5 Gauff
The teenagers are just hitting forehands from one corner of the court to the other.
Potapova's ends up in the net.
Here we go...
Gauff has two match points!
*Potapova 6-3 2-6 4-5 Gauff
Gigi Salmon
BBC TV at Eastbourne
What is going through Potapova's mind right now?
*Potapova 6-3 2-6 4-5 Gauff
Leon Smith
GB Davis Cup captain on BBC Radio 5 Live
It's a great atmosphere in here and it's a big job now for Potapova. I thought Coco was going to run away with it. It was a smart move from Potapova to take a medical timeout. I'm not saying it was untoward, but smart.
*Potapova 6-3 2-6 4-5 Gauff
Gauff's backhand creeps over the net, but Potapova's reply doesn't have the same fate as it fails to make it over.
Gauff's taken the game and it's 5-4 in the American's favour.
Potapova to serve.
Potapova 6-3 2-6 4-4 Gauff*
Potapova sends her shot slightly long.
This is going to the wire.
40-30 Gauff.
Potapova 6-3 2-6 4-4 Gauff*
Coco approaches the net but her plan doesn't pan out.
Her volley goes wide and she goes 0-15 down.
Potapova 6-3 2-6 4-4 Gauff*
Leon Smith
GB Davis Cup captain on BBC Radio 5 Live
This is what is great. Potapova has risen her game as well. I thought she could have gone away in this final set. She had the trainer on at 4-1 down but now she's 4-4! This is exactly what we want. Let's just remind ourselves that this is two junior players.
Potapova 6-3 2-6 4-4 Gauff*
A stunning backhand from Potapova and it's all square at 4-4!
Injury? What injury?!
*Potapova 6-3 2-6 3-4 Gauff
Back to deuce before it's advantage Gauff and she has another break point.
But Potapova screams as she blasts a backhand past Coco.
Deuce.
Advantage Potapova.
*Potapova 6-3 2-6 3-4 Gauff
Leon Smith
GB Davis Cup captain on BBC Radio 5 Live
That is absolutely stunning! What a backhand! An unbelievable shot! Wow.