Andy Murray wary of Karen Khachanov test

Andy Murray in action at the US Open on August 30, 2016
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World number one Andy Murray admits that he is wary of an upset when he faces Karen Khachanov in the fourth round of the French Open.

Andy Murray has admitted that he is wary of falling victim to an upset when he takes on Karen Khachanov in the fourth round of the French Open.

The world number one will face the 21-year-old for the first time at Roland Garros after Khachanov overcame John Isner to advance into the last 16 of a Grand Slam for the first time in his career.

Murray has struggled on clay at times this year, but he is confident that he is beginning to find his form again following some improved showings so far at the French Open.

"I have never played a match against him, but I practised with him before he got on to the tour when he was like 350 (in the rankings), and he was really good. Big, strong guy. Generates a lot of power. He's also got a big serve," he told reporters.

"I believe in myself, so even when things aren't going well, I believe I can turn it around. It's not easy but, if you do the right things in practice and trust it, it's going to come.

"The five-set format has definitely helped, so I have maybe not been as anxious going into some of the matches, because I know there is some time to turn it around. But mentally I feel pretty good just now. I'm working things out while I'm playing the matches, and that's a really, really important part of my game."

Murray is bidding to reach the final of the French Open for the second year in a row.

Andy Murray in action at the US Open on August 30, 2016
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ATP RankingsPoints
1Scotland flag Andy Murray10,370
2Serbia Novak Djokovic7,445
3Switzerland Stanislas Wawrinka5,695
4Spain Rafael Nadal5,375
5Switzerland Roger Federer5,035
6Canada Milos Raonic4,450
7Austria Dominic Thiem4,145
8Croatia Marin Cilic3,765
9Japan Kei Nishikori3,650
10Alexander Zverev3,150
11France Jo-Wilfried Tsonga3,120
12Belgium David Goffin3,055
13Bulgaria Grigor Dimitrov2,900
14Czech Republic Tomas Berdych2,885
15United States Jack Sock2,415
16France Gael Monfils2,365
17Lucas Pouille2,320
18Spain Roberto Bautista Agut2,155
19Australia Nick Kyrgios2,155
20Albert Ramos-Vinolas2,065