John McEnroe's rage always had a place in tennis, but 'roid rage? The fiery champ says it was painkillers, but still, the topic is causing quite a racket heading into the Australian Open, which begins on Sunday. Thanks to Illegal Motion, here's how to tell when a player is on the juice if you tune in and don't have the eye of a line judge.

Randall Polliard is a sports cartoonist for the Seattle Times.