Sweat drips down your face. The crowd is in a hush, stunned into silence as they watch the tennis ball bounce back and forth, back and forth. You swing your racket, returning the tennis ball right where you want it. Your opponent dives to try to Make the save but comes up short. The crowd goes wild. Your knees go weak, finally feeling the strain you've been putting on them, but it doesn't Matter. You have just become the newest tennis champion.