Britain’s Andy Murray says he needs to remain focused as he prepares to take on French man Jo-Wilfried Tsonga in the men’s quarter-finals at Wimbledon.
Second seed Murray has yet to drop a set at this year’s tournament and the 2013 champion is the highest-seeded player remaining in the men’s draw.
But the 29-year-old described Frenchman Tsonga as “one of the best grass-court players in the world”.
“If he plays well, I’m not on my game, I can lose that match,” said Murray.
Murray, competing in his ninth consecutive Wimbledon quarter-final, has beaten Tsonga in 12 of their 14 encounters – twice at Wimbledon.
The Scot beat the 12th seed in the quarter-finals in 2010 and the semi-finals two years later, both in four sets.
“Both matches were hard,” said the two-time Grand Slam champion.
“A few of the sets came down to just a couple of points. I’m aware I’ll have to be playing at my highest level to win.
“I think if I play the level I’m playing at just now, I give myself a chance in most matches.
“But the trick is to keep that up, to maintain that level for the whole two weeks. I’ve done a good job of it so far. I do feel like when I’ve needed to in the tournament, I have played some good tennis.”