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In Rome this year, Nadal attempted 15 first serves to Djokovic's forehand in the deuce court, compared to 10 down the center "T" to his backhand, according to Craig O'Shannessy, a strategy analyst who compiles data on pro tennis.
WSJ: Rafael Nadal, the Underrated Tactician, Stalks Novak Djokovic
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"In five, 10, 20 years, tennis without data will not be possible, " said Eric Babolat, the company's CEO.
WSJ: Babolat Microchip Racket: The Racket of the Future
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The data clearly shows that American male tennis players were well accounted for in the upper-echelon of professional tennis from 1978 through 1996.
FORBES: The Economics of Why American Men's Tennis Struggles to Achieve Yesteryear's Dominance
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All told, there are 5.4 million frequent tennis players in the United States, according to TIA data, down 3% from last year.
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