Coco Gauff wiped away a flood of tears after a litany of service errors to defeat unseeded Croatian Donna Vekic 7-6 (7-5) 6-2 to labour into the third round of the US Open.

Gauff has teamed up with biomechanics specialist Gavin MacMillan and although she is still adjusting to a retooled serve, Gauff had to battle hard to edge out Vekic in a dramatic evening session encounter.

“Honestly, today was a tough match for me. But I’m just happy with how I was able to manage. It’s been rough couple weeks,” Gauff said during her on-court interview, before pausing as she began to cry.

“You guys bring me so much joy I’m doing this for myself but also for you. No matter how tough it gets inside, you can do it.”

Both players struggled for rhythm in the first set under the primetime glare of Arthur Ashe Stadium, Gauff reined in her unforced errors on serve just enough to clinch it via a tie-break.

The 2023 champion had wept into her towel during a break in play after being broken in the ninth game and later practiced her delivery when Vekic was receiving treatment from the physio for a right arm problem.

After a combined 16 double faults in the opening set, both players eventually composed themselves but it was Gauff who pulled away to build a 3-1 lead.

The American, who had also laboured in her first round match against Ajla Tomljanovic, capitalised on a string of errors from Vekic to break to love once more before securing victory, avenging her third-round loss to the Croatian at last year’s Paris Olympics.

Gauff also paid tribute to legendary Olympic gymnast Simone Biles, adding: “I saw her and she helped me pull it out. I was thinking ‘if she can go on a six inch beam and do that with all the pressure of the world, then I can hit the ball in this court’. She’s an inspiration.”

Venus claims first Grand Slam victory for four years

Venus Williams rolled back the years with an impressive performance and she agreed to team up with Canadian Leylah Fernandez in the opening round of the women’s doubles..

Facing sixth seeds Lyudmyla Kichenok – who won the title last year with Jelena Ostapenko – and Ellen Perez, 45-year-old Williams and Fernandez fought back from a first-set deficit to claim a 7-6 (7-4) 6-3 win.

It is Williams’ first win at a major since beating Mihaela Buzarnescu in singles at Wimbledon four years ago, while her last slam doubles victory came with her sister Serena at the French Open back in 2018.

“Thank you to my partner, best partner I’ve ever played with outside of Serena,” said a beaming Williams.

The American won 14 Grand Slam titles alongside Serena, with the most recent coming at Wimbledon nine years ago.

Asked about Fernandez’s approach, Williams said: “I couldn’t believe it, it was 10pm. I was thinking to myself, ‘I’m not very good at doubles’.

“I really don’t know what I’m doing, I just try really hard. Thank you for giving me the opportunity to be back here.”

Fernandez is best known for having lost to Emma Raducanu in the singles final here four years ago and she made a little-and-large combination with Williams that turned out to be very effective.

“I don’t think we came in with a plan,” said the Canadian, who is 23 years younger than Williams.

“We tried to figure things out in the beginning. It was a great atmosphere, a lot of fun. I’m just honoured to be sharing a court with Venus.

“It was nerve-racking, exciting. The night before I was shaking. Once we started, everything started flowing so it was good.”

Watch the US Open in New York, live on Sky Sports or stream with NOW and the Sky Sports app, giving Sky Sports customers access to over 50 per cent more live sport this year at no extra cost. Find out more here.