Britain's Harriet Dart says she is enjoying having her mum as her coach as she prepares for her second-round US Open match against Marta Kostyuk on Wednesday.

The 28-year-old sailed though the first round with an assured 6-1 6-2 win over Chloe Paquet of France.

She will now face Ukrainian 19th seed Kostyuk as she bids to reach the third round at Flushing Meadows for the first time.

Dart's mother Susie has stepped up as her coach for the New York tournament because her regular coach Olga Morozova is reluctant to travel outside the UK.

"It's a different dynamic, that's for sure," Dart said.

"We've only had one argument, so that's good. It's just little things and I think it's easier when it's your mum because two minutes later you're all fine."

The British number three has reached a career-high ranking of 78 after an encouraging run to the Wimbledon third round in July.

However, she may be without her coach if she does advance - her mum is a teacher and is due to fly home with the new school term starting next week.

"She's due to go back Friday, but we'll see. We'll come to that when we need to," Dart added.

"It's been nice to have her, she knows me really well.

"She says her role is throwing me balls but there's much more to it than that."

Dart is the only Briton in singles action on Wednesday, with Jack Draper, Katie Boulter and Dan Evans in the opposite side of the draw.

The doubles competitions begin in New York, with Britain's Wimbledon champions Henry Patten and Finland's Harri Heliovaara taking on French duo Sadio Doumbia and Manuel Guinard.

Neal Skupski joins Michael Venus of New Zealand against another French pairing of Hugo Gaston and Gregoire Jacq.

British women's singles number one Katie Boulter teams up with Anna Kalinskaya of Russia to play China's Wang Xinyu and Zheng Saisai.

Elsewhere, defending champions Coco Gauff and Novak Djokovic return to Arthur Ashe Stadium to headline the evening session, which begins at 00:00 BST on Thursday.

Third seed Gauff will continue her US Open "victory lap" against German veteran Tatjana Maria, the world number 99, in the second round.

That will be followed by Djokovic taking on fellow Serb Laslo Djere as he resumes his bid for a record 25th Grand Slam title.

Djokovic, 37, is still searching for a first major triumph this year, having won at least one every year since 2017.

Alexander Zverev, the men's French Open runner-up, and women's second seed Aryna Sabalenka are among the players in action on Louis Armstrong Stadium.

Wimbledon champion Barbora Krejcikova and Olympic gold medallist Qinwen Zheng both feature on Grandstand before men's eighth seed Casper Ruud takes on French showman Gael Monfils.