Novak Djokovic believes grass is the most demanding—and dangerous—surface.

The three-time Wimbledon champion was asked if he regards grass as more dangerous than other surfaces after his 6-2, 7-6 (9) Eastbourne quarterfinal conquest of Donald Young today.

More: Djokovic Battles Into Eastbourne Semifinals

“Yes. Yes, I think so,” Djokovic replied. “I mean, again, it really depends on which surface you're playing on in which particular time of the year, because the weather conditions and the nature obviously affects a lot, because this is an outdoor sport so we play mostly outdoors.

“Of course sometimes clay can be very dangerous if it's too soft. Then it's not that great for ankles. But grass, I mean, grass is very demanding surface. Especially those far reaches and those gets when you're running all over the court, especially if you're further back, that's where you are in kind of a danger zone in terms of movement.”

While grass provides a gentle landing spot for players who dive on court, Djokovic said humidity can make lawn tennis a slippery experience.

“I mean, just simple fact that when it's humid and when there is moist on the grass, as smooth as it is, it's still slippery,” Djokovic said. “All it takes is to have one wrong move, lose your footing. A lot of things can happen, obviously.”

Photo credit: Wimbledon