He's an artist on this surface. He can stay back. He can come in. No weaknesses. Federer could win Wimbledon six, seven, eight times. He can play on any kind of surface, he is so complete. And if he continues the way he has been doing and stays away from injuries and still has the motivation, he will be the greatest player ever. I think the motivation is the key thing and he has the motivation to continue to play for another three or five years.