If you can react the same way to winning and losing, that's a big accomplishment. That quality is important because it stays with you the rest of your life, and there's going to be a life after tennis that's a lot longer than your tennis life.
“The test for whether or not you can hold a job should not be the arrangement of your chromosomes.”
“I may sometimes be willing to teach for nothing, but if paid at all, I shall never do a man's work for less than a man's pay.”