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Danish Caroline Wozniacki listens to her coach Sven Groeneveld during their final match of the WTA Madrid Open claycourt tournament against Russian Dinara Safina on May 17, 2009 in Madrid.  AFP PHOTO / JAVIER SORIANO (Photo credit should read JAVIER SORIANO/AFP/Getty Images)
Danish Caroline Wozniacki listens to her coach Sven Groeneveld during their final match of the WTA Madrid Open claycourt tournament against Russian Dinara Safina on May 17, 2009 in Madrid.  AFP PHOTO / JAVIER SORIANO (Photo credit should read JAVIER SORIANO/AFP/Getty Images)

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    On-court coaching's new tech advantage

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On-court coaching's new tech advantage

On the women's tennis tour, the players are allowed to call for their coaches during a match. And now they can even check out real-time performance data.

On-court coaching's new tech advantage

On the women's tennis tour, the players are allowed to call for their coaches during a match. And now they can even check out real-time performance data.