Psychotennis, Anyone?

"Psychotennis, Anyone?" by Lloyd Williams is a science fiction story that looks at what happens when people can move things with their minds in a brand-new version of tennis. The story is about Dr. Grant Lane, the inventor of this telekinetic sport, who sees it become corrupted by a cruel player named Slag. After Lane's student, Tony, is hurt in a game, Lane feels bad and the public wants to shut the sport down. Lane starts to think that someone is cheating and discovers that the real problem is not the game, but how the players and their managers are acting. In the end, Lane faces Slag in a match that shows how bad people can be when they really want to win.