Dr. Don Mueller, is a physics professor and a proponent of (and markedly skilled at) playing tennis with two rackets. At its essence, the game is simple: Instead of playing tennis with one racket in your dominant hand, you play with one in each hand. Mueller, who is tall, lanky and energetic, said he began using two rackets seriously about three years ago, after playing for a while with one racket that he switched back and forth from hand to hand…read article…