There's tension at the U.S. Open

KNOXVILLE, Tenn. (AP) - September 6, 2012

The Open is providing a showcase for an invention by an amateur tennis player.

David Glass is a Tennessee engineer who has developed a way of measuring net cord tension.

Glass says tension varies from court-to-court and tournament-to-tournament.

He says Wimbledon is "notorious" for very loose nets.

Glass has a patent on his TNT Gauge system.

It was tested at the U.S. Open last year on two courts.

It's being used on all the courts this year.

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