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Shouldn't you at least take a peek at your opponent, maybe out of
corner of your eye? No: You are not trying to hit him. You strive to miss him. Therefore, since you must watch what you strive to hit and not follow what you only wish to miss, keep your eye on
ball, and let your opponent take care of himself.
Tilden provided a chart in The Art of Lawn Tennis, a very simple one, but one that I hope you will commit to memory. It looked something like this:
A1234B
Imagine a ball passing from point A to point B, with you as
receiving player at B. According to Tilden, it can be taken as a scientific fact that if you keep your eye on
ball throughout its flight, your chance of making a good return is five times as great as it would be if you took your eye off
ball at point 4 (4/5ths of a second of its flight). Furthermore, your chance is ten times as great as it would be if your removed your eye from
ball at point 3 (3/5ths of a second of its flight).
Tilden wrote: The average player follows
ball to 4, and then he takes a last look at his opponent to see where he is, and by so doing increases his chance of error five times. ... Remembering
85 percent errors in tennis, I again ask you if it is worth while to take
risk?
Keeping your eye on
ball is a good practice not just because you make fewer errors, but also because it strengthens
other parts of your game through developing
habit of concentration. As Tilden humorously explained, It tends to hold [your] attention so outside occurrences will not distract. Movements in
gallery are not seen, and stray dogs, that seem to particularly enjoy sleeping in
middle of a tennis court during a hard match, are not seen on their way to their sleeping quarters.
So there you have it one-fifth of a second that can make all
difference in your tennis game. It can truly be
magic moment for you, IF you cultivate
discipline to keep your eye on
ball not just occasionally or even most of
time, but during every single shot.
P.S: Bill Tilden's The Art of Lawn Tennis is in
public domain, which means you can find it and read it online for free. I highly recommend that you do so. Although his references to events and personalities are of course dated, his playing advice is timeless.

Steve Smith is a writer who lives near Chapel Hill, North Carolina. His Web site, Tops 4 Tennis (http://www.tops4tennis.com), includes the complete text of The Art of Lawn Tennis by Bill Tilden, plus other articles and links for tennis players and fans.