"Stand by," the replay official told the computer operators inside the Player Challenge Booth, high above Arthur Ashe Stadium. Seeing Federer point his racket and the chair umpire signal, Bradshaw gave the command: "System ready ... launch!"

Seconds later, the instant-replay recreation showed up on the videoboard Saturday. Federer was right, his return early in the first set was good. The call was overturned, and Federer beat Nikolay Davydenko in straight sets in their U.S. Open semifinal.

Standing in the back of the booth, surrounded by five other people, several laptops, a couple of TV monitors and a small refrigerator, Paul Hawkins managed a slight smile.

With a Ph.D. in artificial intelligence, Hawkins spent five years developing the Hawk-Eye technology that's brought replay to Grand Slam tennis for the first time. In his early 30s and from England, Hawkins originally designed the system for cricket.

But after a blown call during a quarterfinal between Jennifer Capriati and Serena Williams at the 2004 U.S. Open, the U.S. Tennis Association thought again.

There have been few complaints -- Marat Safin, known for his quirky behavior, wondered how precise the system was. Generally, there have been more questions about the challenge system, not the technology itself.

"The players are the focus at the tournament. We're here to make sure they remain the focus, rather than the officials," Hawkins said. "Going into the finals, I might be a little nervous, like the players. It took a long time to build up this system, but it would take only one wrong call to tear it down."

Looking out from the open-air replay booth, Hawkins could see Shea Stadium, where the New York Mets played the Los Angeles Dodgers. The NFL, NBA and NHL all use some form of replay, but baseball remains a holdout.

Leander Paes won his fourth Grand Slam doubles title, teaming with Martin Damm to defeat Jonas Bjorkman and Max Mirnyi 6-7 (5), 6-4, 6-3 Saturday at the U.S. Open.

Paes, from India, and Damm, from the Czech Republic, were seeded sixth. Damm won his first Slam doubles championship after being the runner-up at the 2006 Australian Open and 1993 U.S. Open.

Bjorkman, from Sweden, and Mirnyi, from Belarus, defended their French Open championship in June. They've each won U.S. Open doubles titles, playing with different partners.

In April, U.S. Open junior boys finalist Peter Polansky needed 400 stitches after a freak sleepwalking accident threw his tennis future in doubt.

The 18-year-old Polansky was an alternate on the Canadian Davis Cup team when he wandered out his third-story hotel window in Mexico and fell. He severed an artery in his left calf and had to go through five hours of surgery.

"I'm really happy the way things are going for me right now," Polansky said. "I've tried to just remain focused. The past few months in rehab has certainly taught me how to concentrate."

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