Tennis study shows John McEnroe was right about line calls - 40pc of the time - Telegraph

Tennis study shows John McEnroe was right about line calls - 40pc of the time

"The John McEnroe effect has been unravelled by scientists who say that players really do see things differently from the line judges.

John McEnroe debates another line call with an umpire
John McEnroe debates another line call with an umpire

A comprehensive study of tennis matches shows precisely how much harder it is to see on which side the ball bounces, when it comes down within four inches of the line."