Hall of Fame
Good question. Because I know myself best but I don't know my opponents. My coach tells me that.What does it matter how he feels? It's completely irrelevant. People have irrational feelings all the time. Even people that a good at what they do.
And interesting that you bring up coaches. Because that argument also works against what you are trying to argue. If professional tennis players are the best at judging their own game then why do any of them have coaches?