I have read that Pancho Gonzales and Dennis Ralston, among others, said that they played their best when they were angry. I don't even want to mention McEnroe because he was so complex. I think the idea is that some personality types play better when riled...there's a difference between that kind of edginess and being controlled by anger to the point of playing stupidly and impatiently. My question is how anger aligns with the Inner Game approach, which is what we are told to strive toward. Maybe I should reread the book, but I can't believe Gallwey would see much positive about playing angry.