Britain’s Dan Evans and Cameron Norrie beat German pair Tim Putz and Jan-Lennard Struff in the first round of the men’s doubles at the US Open.

The Britons, who were knocked out of the singles competition this week, won 6-3 1-6 6-1 on court nine.

Evans had earlier lost 6-2 6-2 6-1 to five-time singles champion Roger Federer on Arthur Ashe.

Compatriot Jonny O’Mara is also through, alongside partner Marcelo Arevalo from El Salvador.

They beat German Mischa Zverev and Frenchman Benoit Paire 4-6 6-4 6-1.

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But Britain’s Ken Skupski, alongside New Zealand partner Marcus Daniell, were beaten 6-7 (5-7) 7-5 7-6 (7-1) by Australian Nick Kyrgios and Romanian Marius Copil.

In the mixed doubles, Britain’s Joe Salisbury and American Desirae Krawczyk booked their place in the second round with a comfortable 6-2 6-2 victory over Americans Hailey Baptiste and Jenson Brooksby.

Meanwhile, Britain’s Neal Skupski and Spanish partner Maria Jose Martinez Sanchez lost 6-4 6-3 to fourth seeds Ivan Dodig and Latisha Chan from Bosnia and Herzegovina and Taiwan respectively.

Elsewhere, Belarusian Victoria Azarenka and Australian Ashleigh Barty, seeded eighth, beat Romanian Monica Niculescu and Russian Margarita Gasparyan 4-6 6-1 6-1 to progress to the second round of the women’s doubles.

And American teenagers Catherine McNally and Coco Gauff – who won the Washington Open together this month – triumphed 7-6 (8-6) 6-2 against German Julia Gorges and Czech Katerina Siniakova.

Gauff, 15, takes on world number one Naomi Osaka in the third round of the women’s singles on Saturday.

Former US Open champion Juan Martin del Potro expects to make his return from a broken kneecap at Stockholm in October.

The Argentine, 30, has not played since hurting his right knee at Queen’s in June, during the build-up to Wimbledon.

Del Potro, who first fractured his kneecap last October at the Shanghai Masters, had surgery before returning home to begin his recovery.

“I’m very happy to tell you that I’ll play in Stockholm and Vienna in October,” he said on Twitter.

“These two tournaments are very special to me, as I had the chance to win both of them.”

Del Potro won the US Open in 2009 and finished runner-up last year to Novak Djokovic, but has missed this year’s tournament because of the injury.

He is a two-time winner of the Stockholm Open, which runs from 14-20 October, and also claimed the 2012 title in Vienna, where he plans to compete the week after.

Third seed Karolina Pliskova is among the favourites to win the women’s singles at the US Open and will play Tunisia’s Ons Jabeur in the third round on Friday.

In her latest BBC Sport column, the Czech discusses her relationship with twin sister Kristyna, who is also a WTA Tour player, how they shared a hotel room before they played each other in Birmingham recently…

When the draw for a Grand Slam tournament is made I’m always worried that Kristyna and I will be drawn against each other in the first round – that would be the worst day of my life!

There would be too much pressure and too many nerves because the Grand Slams are so important and mean so much to us.

So it is always a relief when my sister is in the opposite half.

That’s what happened here at the US Open, although it was sad that she lost to Elise Martens in their second-round match on Thursday.

We don’t watch the draw as it is being made, nor do we follow it on social media, and then when we do eventually see it we message and always say: ‘Phew, we are not playing each other!’

We have only played each other once on the WTA Tour and that came a few months ago in Birmingham.

It was a very difficult situation for both of us – and the worst thing was that we were sharing a hotel room at the tournament!

We have played each other many times when we were younger – in qualifiers and on the lower-ranked tours – but we hadn’t played for about six or seven years.

We had come close a couple of times in main draws but either I lost or she lost earlier, and also I had to withdraw once because of injury when we were supposed to play in Prague.

So it felt like everybody was waiting for this match to happen, the Czech media were excited and many people were talking about the match.

‘Our parents couldn’t watch’

It was a strange atmosphere in our hotel room on the morning of the match.

Kristyna and I were trying to be calm and act normal, but all the people around us and our teams were stressing and wanted to talk about it so much.

Thankfully our parents weren’t there in Birmingham, I can’t imagine how horrible it was for them. They didn’t even watch on television back in the Czech Republic.

My mum doesn’t usually like to watch our matches anyway because she is too nervous. My father usually does watch matches – but not this one. He did something else to take his mind away from it.

So we both felt very nervous and didn’t know what would happen – if we would play good tennis or bad tennis.

It was huge pressure for me because if you look at the rankings I should win easily.

Of course I wanted to win the match, but I also didn’t want my sister to lose. It was an emotional rollercoaster. We ended up playing a long match and Kristyna won 6-2 3-6 7-6 (9-7)!

It was the biggest victory of her career – she had never beaten a top-five player before that.

Kristyna is ranked 86th at the moment but I believe she has the ability to improve that a lot. She is not easy to beat.

If we could both be ranked in the top 10 together that would mean a lot to both of us – even more to her of course – and our families.

But that would also mean we would play each other even more, which is something I’m not sure I would enjoy!

Maybe it is something you could get used to if it is happening more often, and then we wouldn’t be as super stressed about it like we were in Birmingham.

‘Sometimes I talk to Kristyna more than my husband’

Of course we look similar because we are identical twins. However, I think we have aged a little differently, and we try to be different because we have never wanted to be the same.

We have different tattoos. She is a little more blonde. And our personalities are quite different.

But sometimes we think in the same way, and we often say the same thing at the same time – that makes people laugh.

She thinks a little more about stuff and is more responsible. She is two minutes older – so maybe she is trying to be like the boss a little bit and protect me!

We still give each other advice about tennis; we give advice to each other about everything in life.

Barely an hour goes by when we aren’t talking on the phone – I text “hi” as soon as I wake up and and we continue all day on WhatsApp.

Sometimes I speak to her more than my husband! He doesn’t mind though and he’s happy for Kristyna to hang out when it is just the three of us.

The week before the US Open we went to watch some Broadway shows together – Pretty Woman and Frozen – and had a few dinners, and also did some walking and shopping.

With us being in different parts of the draw – I played Monday and Wednesday, and Kristyna played Tuesday – we have not done much in the past three or four days because you don’t want to go into Manhattan and waste energy.

I need all my focus on going as far as I can in the tournament and hopefully winning my first Grand Slam.

Karolina Pliskova was talking to BBC Sport’s Jonathan Jurejko at Flushing Meadows

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German sixth seed Alexander Zverev was taken to a deciding set for a second successive match as he saw off American Frances Tiafoe 6-3 3-6 6-2 2-6 6-3 in the US Open second round.

Zverev hit 52 unforced errors as the momentum swung throughout.

Second seed Rafael Nadal had a walkover, with Australian Thanasi Kokkinakis withdrawing with a right shoulder injury.

The three-time champion will play South Korea’s Chung Hyeon in the next round.

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Australian Nick Kyrgios produced a stunning display of serving as he hit 24 aces in his routine 6-4 6-2 6-4 win over unseeded Frenchman Antoine Hoang.

Kyrgios, the 28th seed, has now reached the third round four times but has never made it past that phase. He now takes on unseeded Russian Andrey Rublev, who got through as a result of the retirement of Frenchman Gilles Simon after the first set of their match.

Meanwhile, Zverev will play Slovenian Aljaz Bedene, who beat 29th seed Benoit Paire, in the third round.

The 22-year-old, who defeated Radu Albot in the first round, said: “Frances gave me an unbelievable fight today. I’m just happy to get the win somehow.”

Elsewhere, in-form Cincinnati Masters champion Daniil Medvedev recorded his 16th win from the past 18 matches with a 6-3 7-5 5-7 6-3 victory over Hugo Dellien of Bolivia. The Russian fifth seed will now play Spain’s Feliciano Lopez.

American Denis Kudla’s reward for defeating 29th seed Dusan Lajovic 7-5 7-5 0-6 6-3 is a third-round contest against defending champion and world number one Novak Djokovic.

French 13th seed Gael Monfils and Canada’s world number 33 Denis Shapovalov will face each other after they enjoyed comfortable wins. Monfils defeated Romania’s Marius Copil 6-3 6-2 6-2 and Shapovalov beat Swiss Henri Laaksonen 6-4 7-6 (7-2) 6-2.

Swiss 2016 champion Stan Wawrinka, 34, saw off fellow veteran Jeremy Chardy of France 6-4 6-3 6-7 (3-7) 6-3. The 23rd seed will now play Italy’s Paolo Lorenzi.

Belgian 15th seed David Goffin, beaten by Medvedev in the recent final at Cincinnati, defeated Gregoire Barrere 6-2 6-2 6-2 and will play Spain’s Pablo Carreno Busta in the third round.

American 14th seed John Isner, a quarter-finalist last year, will play Croatia’s 2014 champion Marin Cilic, after he secured a 6-3 7-6 (7-4) 7-6 (7-5) victory over Jan-Lennard Struff of Germany.

And Australian Alex de Minaur, 20, overcame Chile’s 31st seed Cristian Garin 6-3 7-5 6-3 to set up a tie against seventh seed Kei Nishikori.

American teenage sensation Coco Gauff is set for an intriguing US Open third-round match against defending champion Naomi Osaka after beating Timea Babos 6-2 4-6 6-4 on Louis Armstrong Stadium.

The 15-year-old, who came to prominence at Wimbledon, and the Hungarian world 112 produced a superb spectacle.

Gauff broke three times in the opening set before Babos fought back to level.

In a third set of lung-bursting rallies, Gauff crucially broke in the 10th game to seal victory.

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The American is back on court on Friday for a doubles match and said that she would think about the match against Japanese world number one Osaka on Saturday – the day of their encounter.

She also paid tribute to Babos for her part in a thrilling match, saying: “Timea played so good and I’m so happy to get through.

“I was tested a lot. We both just tested each other. If I didn’t win the last point maybe she would have won the match.”

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