If I don't practice the way I should, then I won't play the way that I know I can.
I certainly don't lose any sleep if I lose a tennis match.
I have seriously thought about retiring, but that was on a good day. On a bad day I've thought about killing myself.
Not winning at Wimbledon is not going to bother me forever.
My serve and my forehand I pretty much always had, but my backhand was a made backhand. I worked on it for years.
What I like about golf is there are no bad calls.