How to control/relax/get rid of anger while playing ping pong?

Or any other game for that matter. I am actually good at ping pong, but less so than my older brother, for obvious reasons. When I am chill I play well, but when I start to get riled up and angry, I start to play terribly. The most recurrent cause is when I start to lose easy points. How do I learn to either vanquish this anger, or relax it?