John McEnroe: "I played him when he was 16 or 17 and he had an energy to him then. He wasn't educated in the sense he went to college or high school, but he seemed to be an intelligent young guy. I find it amazing that he's made this transformation. There were times Andre had a chip on his shoulder. Then he dedicated himself to the sport and he's become this incredible ambassador."

Jim Courier: "He chose the hard road. He put in the time and he didn't fake it. He didn't cut corners and he started to maximize his ability and winning the Open was his reward for that."

Roger Federer: "He was a very important person in tennis for all of us. He inspired many of today's generation. He was an inspiration also in terms of his foundation and his results, like winning all four majors."

Lleyton Hewitt: "He's one of the best that I've ever played. He's definitely the best ball-striker that I've ever played against, the cleanest hitter of the ball. I enjoyed growing up watching a guy like Andre Agassi. I liked the clothes he wore when I was younger and his personality on and off the court."

Nick Bollettieri: "I began to recognize that I couldn't treat Andre Agassi the way I had treated other students, that he was like a wild horse, and I had to capitalize on his free spirit, not break it."

Patrick Rafter: "I think Andre Agassi is one of the greatest role models that we have in tennis. It's important with my young family to understand charity work and to get them involved as much as I can; I hope to be a role model for them."

Lindsay Davenport: "It is hard watching him. It is emotional for the players as well as for himself. You can see how much he means to everybody in the sport and how much all of this means to him. He seems totally at peace with his decision and just wants to go out on a high."

Pete Sampras: "The way I look at the top five, (Rod) Laver, (Roger) Federer, myself, Borg and (Ivan) Lendl. I think those five guys dominated their generations better than anyone. Maybe Roger will dominate better than any one of the other four. Maybe I put Andre (Agassi) as kind of six through 10 with, you know, (John) McEnroe and (Jimmy) Connors, kind of those guys. That's kind of how I see it."

Guillermo Coria: "I used to see him play when I was a kid, with his long hair. I used to like his attitude on court. I used to like his appearance, the way he used to dress; he was different.

Mario Ancic: "What Andre does is great for tennis. All the guys can look up at him and he can be their role model."