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Mum's the word for Istomin
As far as Andy Murray's next US Open opponent Denis Istomin is concerned, mum always knows best.
The 26-year-old from Uzbekistan is unique among leading male players in that he is coached by his mother.
Klaudiya Istomina, a keen player herself, introduced her son to tennis and has coached him throughout his career.
Istomin said: "We have a good relationship and we understand each other very well. She has known me since I was born!
"She always tries to help me with everything, not just tennis, normal life as well.
"She gives me good words to improve my tennis, my life, everything. I'm happy to be coached by my mum."
He concedes it does have its downsides, though, such as not being able to answer back.
Gesturing to indicate a clip round the back of the head, Istomin said: "I try to say my way as well. Sometimes I say, 'I can't feel the ball like you say'.
"She says: 'Do it like this and you will be okay. Just listen to me.' She's normally right. I will try to fight but in the end I give in."
The relationship also has its challenges from a practical point of view.
"I don't think the other players think it is unusual," said Istomin. "But it's tough for the other players to travel with female coaches.
"Even to go into the locker room before the match and talk - they cannot do it. I always go outside and start to talk before the match with my mum. So it's also tough for me as well."
Istomin is ranked 65th in the world and is through to the fourth round at a grand slam for only the second time after beating Andreas Seppi in five sets on Sunday.
Murray has won their only previous meeting, in Brisbane this year, but Istomin is a dangerous big-hitter who took a set off Novak Djokovic in Montreal last month.
The Uzbek said: "I'm looking forward to it. I've just played him once, I lost in two sets. But it was a close match. I will try to play the same tactics as I did there and we will see what happens.
"He's a great returner. He returns almost everything. The key is my serve. I will try to serve better than usual.
"He moves on the court incredibly but I will try to move him more and try to beat him.
"If I win, it will be the biggest match of my life. I'm looking forward to this match. I will try to play my game and concentrate on winning."
Murray was coached by his mother Judy until he was 12 and she remains an important part of his support team
The Scot, who overcame third-round opponent Florian Mayer 7-6 (7/2) 6-2 6-2, said: "There's not loads of people that get coached by their parents. A lot of them do from a young age, but not so much when they're on the tour.
"Obviously it works for him. Technically he's very sound. He's a good player. He hits the ball very flat. He served extremely well I think in his match (against Seppi). I saw some of the stats at the end.
"He's played well. He had a very good match with Novak in Montreal. He's had some good wins this week as well."