How John McEnroe Adopted His Unusual Serve Motion

John McEnroe had a uniquely peculiar service motion, but it wasn't always like that. If you look at him in his 1978 NCAA Singles Final on this channel,    • 1978 NCAA Tennis Finals - John McEnroe vs ...  , you will see that he hit his serve in an orthodox manner. However, after he had turned professional in 1978, he changed his service preparation motion. Listen to him explain why in this post-match interview in Hawaii.