“I tell the players: You'll hear a lot of applause in your life, fellas, but none will mean more to you than that applause-from your peers. I hope each of you hears that at the end.” ― Andre Agassi, O 

Tennis is a perfect combination of violent action taking place in an atmosphere of total tranquillity.
When I was 40, my doctor advised me that a man in his 40s shouldn't play tennis. I heeded his advice carefully and could hardly wait until I reached 50 to start again.