Andy Murray heads into his Wimbledon semi-final against Roger Federer full of admiration for the 33-year-old's continued success.
Roger Federer's longevity has been lavishly praised by Andy Murray as the duo prepare to renew rivalries for a place in the Wimbledon final.
Chasing an 18th grand slam title and first since defeating Murray at SW19 in 2012, Federer heads into Friday's Centre Court showdown having never lost a Wimbledon semi-final.
A month shy of turning 34, Federer is comfortably the veteran of tennis' 'Big Four', but he remains a class act, as Murray is quick to point out.
"The reasons why he's still at the top is he has a pretty efficient game style," said the Scot of the world number two.
"He's quite loose on the court. But he's also played loads of matches over his career.
"So it's very impressive that he's managed to stay at the top of the game for so long, considering how long he's been at the top of the game for and how many matches he's played.
"It's significantly more than a lot of the guys that have been at the top of the game for a long time.
"He's won over a thousand matches and played over 1,200 matches. That's a lot of tennis.
"I have no idea how long he can keep competing at the top level. No one knows. It could be three, four years at the rate he's going just now. But that depends on a lot of things."
Murray avenged his 2012 final defeat by going one better 12 months later, his second grand slam success ending a 77-year wait for a British winner of Wimbledon's men's competition.
Home support is always strong for Murray at the iconic grass-court tournament and vocal backing is guaranteed on Friday, although he concedes Federer will also have plenty of admirers in attendance.
He added: "I hope I get good support.
"It's been the case throughout the whole event and every year that I played here. Roger's obviously extremely popular everywhere he goes.
"So, yeah, it might not be, you know, as partisan a crowd or atmosphere as some matches that I play here."