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The tennis serve is one of the most important shots of the game, and there are many different types of tennis serves players can use. Along with a solid forehand and backhand, a good serve is an asset that can alter the tennis ball’s trajectory, dragging your opponent way off-court, or forcing a ball to their weakness, giving you a definitive advantage in every game you serve. Although less widely used than the other main types of serves, the underhand or underarm serve is considered a legal serve according to the official rules of tennis. Famously, Michael Chang defeated Ivan Lendl in the 1989 French Open by using an underhand serve.