In modern tennis, players know how to watch the ball. However, doubles offers the unique opportunity, because of a netman, to disrupt the flow of play. The netman interferes with the returner's ability to watch the ball.
See the attachment below.
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Robert W. (Bob) Schewior has been Director of Tennis at the Chestnut Ridge Racquet Club in Mt. Kisco, NY since 1976. He has coached numerous juniors to national rankings and his adult teams have often made it to playoffs in USTA leagues. He has been a certified USPTA Professional for over 25 years.