Muir, who is also worldwide general manager of Wilson Racquet Sports, says this has manifested in overall increases in ball and racket sales over the same period.

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It also can record the point where ball meets racket, rate your consistency and measure intensity (shots per minute and amount of actual playing time, rather than time on court).

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He'd throw that ball up, whip his racket around with the same hand, and bang -- the guy could murder the ball.

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The simple mini-game replicates an actual tennis match as well as any I've ever seen: Since you're actually swinging the remote like you would a racket, you can hit with varying force or apply spin to the ball, depending on how you move your body.

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At 29, Roddick has settled into the role of the cranky vet, and before 18, 000 at the Garden he played the clown, chucking his racket in playful frustration (though at one point almost accidentally hitting a ball girl) and briefly mimicking Nadal by pulling up his sleeves, exposing his biceps and imitating the Spanish champion's loopy topspin strokes.

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For example, racket sales at specialty shops rose 8% in revenue in just the first two quarters of 2010 and tennis ball shipments rose by 2.7.

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After missing an easy forehand at the net, he tossed his racket in the air and tried to kick it with his foot as if it were a soccer ball.

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