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US Open: Who is Johanna Konta, the Briton who beat Garbine Muguruza?

Johanna Konta was already Britain's last woman standing by the second round of the US Open but now, having stunned Wimbledon finalist and No.9 seed Garbine Muguruza, the 24-year-old qualifier is through to the third round at a major for the first time.

So who is the British No.2 on a 15-match winning streak who takes on Germany's Andrea Petkovic on Saturday?

Commonwealth gains

Born in Sydney, Konta move to the UK in 2005 with her parents -- hotelier Gabor and Gabriella, a dentist -- and sister Emese, settling in Eastbourne. Fluent in both Hungarian and English, she became a UK citizen in May 2012, switching her playing allegiance from Australia to Great Britain with immediate effect. As world No.208 she did not qualify for the London 2012 Olympics, but she has since represented the nation in Fed Cup, something she considers the highlight of her career to date.

Konta's coaching team is based in Spain and she spends most of the year on the road, but she considers herself every bit the Brit. "Obviously I love the environment there," she said of her training base in Gijon. "There are a lot of players to play with. It's a nice little haven for me.

"But I'm still very much a resident of the UK. I haven't spent much time at the National Tennis Centre just because of the way my schedule has worked out. But, yeah, I'm enjoying the set-up I have."

Fifteen love

The last player to beat Johanna Konta? Maria Sharapova.

The Briton's victory over Muguruza was her 15th straight win since her first-round exit at Wimbledon at the hands of the former world No.1. Since then, Konta has landed back-to-back titles on the ITF circuit -- the second-tier competition beneath the WTA tour -- and both in Canada.

Titles in Granby in July and against a strong field in Vancouver landed her 10 victories and set her up nicely for her three-win qualifying run in New York.

It had already been something of a breakthrough summer for Konta before her North American exploits. In May she reached the main draw at Roland Garros for the first time, battling through qualifying before losing in the first round to Denisa Allertova.

Then came quarterfinal runs in Nottingham and Eastbourne, where she beat world No. 34 Zarina Diyas, No.8 Ekaterina Makarova and Muguruza - then the world No.20, who two weeks later reached the Wimbledon final.

At the start of that run, Konta was ranked No.143 in the world. After the US Open she is guaranteed to top her career-high ranking of No.89, already booking herself a spot in the seventies by reaching the third round.

Playing the long game

As well as a personal milestone, Konta's 7-6(4), 6-7(4), 6-2 win over Muguruza made a little bit of US Open history. The 3-hour-23-minute contest was the longest women's match since the tiebreak was introduced in 1970 and, remarkably, it was the third time the record has been extended at this year's tournament alone.

"I had a couple glances on the clock," Konta admitted. "Oh, okay. We have been here for a while." The length of the match, and the quality displayed by Konta until the end, were all the more impressive given the sweltering conditions on day four of the US Open.

Minutes after Konta's win ended, Jack Sock collapsed during his match with Ruben Bemelmans on the shaded Grandstand Court and was forced to retire.

Konta was sympathetic and could certainly empathise, but said exhaustion would not be a factor when she faces No.18 seed Andrea Petkovic on Saturday.

"Oh, I believe I will be absolutely fine by tomorrow," she said. "This is what we train for. This is why we put the hours in that we do. This is not my first rodeo with a three-and-a-half hour match."

On the money

The last time Konta played in the second round of a Grand Slam, at the 2012 US Open, she led 5-2 in the final set against Olga Govortsova. Nerves kicked in, errors racked up and she blew her chance, losing 6-2, 2-6, 7-5.

It may come as little surprise, then, that rather than physical or technical adjustments, Konta attributed her recent success to vastly improved mental strength. For that, she had the advice of Juan Coto, a former tennis pro turned businessman, to thank.

Coto has switched his attention to coaching executives of Fortune 500 companies and start-ups to think like winners but is friends with Konta's Spanish coach Esteban Carril, and has served as her "mental coach" in recent times.

"He's a big part of my team and with my coaches," Konta said. "He's just helped me a lot with dealing with things and with enjoyment and just keeping things in perspective. This tennis world, this tennis community, is very much a bubble, and it's very easy to get lost in here. There is a real world out there still."

Coto's input may help explain why Konta now finds herself with a winning 2-1 record against top-10 opposition. "If I would go out against some of these players and see them as their ranking, then I probably would have already lost before I even stepped on the court," she said.

"I keep in mind that everyone is human -- there are no super humans out there. I just feel confident in my own ability. I feel confident in my own strength. I'm also just very much trying to stay present."