17. John McEnroe
Johnny Mac usually just talked shit to chair umpires. He would throw tantrums whenever calls didn't go his way. But don't get it twisted, he also got at fellow tennis players. When talking about Ivan Lendl, McEnroe said: "I've got more talent in my pinkie than Lendl has in his whole body. The guy hasn't been good for tennis. He's been so selfish. And he's certainly not the kind of guy who brings out the best in others. He's hurt the popularity of the game so much. Do you like a robot being the world number one?"
But wait here's another great quote. When a Czech opponent mistakenly hit him with a tennis ball, McEnroe told him: "You'll be sorry you hit me you fucking communist asshole." Respect this man.