Is the Player Nervous? Just Ask His Shirt

Ball boys at US Open will wear a special Ralph Lauren shirt that will monitor heart rate, breathing and stress levels.

updated: August 23, 2014 16:30 IST
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File photo: A generic view of US Open venue.

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Tennis has an emotional impact that isn't confined to the court. Consider the ball boy, who speeds the game along by retrieving stray balls for the players.

"It's fascinating to see this guy at the peak of his youth and his health, to watch the stress that he's under when Roger Federer is handing him a ball," David Lauren said last week, just days before the U.S. Open, which starts Monday.

"You can actually see his heart rate spike," said Lauren, who has monitored those activities remotely. "You can see his breathing."

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