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It used to be fans would show up at the US Open, run to a court, and watch some tennis. Now, they can walk into the Flushing Meadows venues, grab a complimentary portable radio, tune in to ESPN2, CBS and the Tennis Channel's live coverage, so that they don't miss the action on the court on their way to all the high tech fan experiences.

The American Express "Challenge A Pro" booth makes fans seem like they're playing against the pros.

"We superimpose people using greenscreen technology and they can have their choice to play against either Sam Querrey or Caroline Wozniacki," says Jon Wolfson of Radiant Event Technology. "And what we do is we cut scenes here in the video and we superimpose them, put it all together and looks like they're playing against one of them. The end product is they go to the American Express website where they can download their video, share it with friends, post it to their Facebook or MySpace."

American Express is also sponsoring the "Rally Experience," for those who want to take on a tennis pro using their phone as your racket. They can walk up to a giant LED screen, dial a 1-800 number and hit the keypad to hit the ball.

The most advanced option may be the US Open's first iPhone application, which has brackets scores, photos videos and also loads of helpful information for fans at the event.

"For the fan who's here, the iPhone app can come in handy," says John Kent of IBM. "It's everything from transportation and parking information to help them get here, to once they are here there's information on where restaurants are, restrooms and other critical facilities around the grounds."

The app can even help attendees find their seats at the stadium once they are ready to watch tennis pro take on pro in the non-virtual world.