Savvy fans know that the early rounds during the first...

Savvy fans know that the early rounds during the first week are the most fun -- the USTA National Tennis Center's smaller “field courts” and grandstand are in constant use, and you can get this close to the players with a grounds pass. Credit: Getty Images

For many people, the U.S. Open tennis championship is like a Super Bowl that lasts two whole weeks. America's only Grand Slam tennis championship -- right up there with Wimbledon, the French Open and the Australian Open -- takes over New York City for a fortnight, and excited fans ride the 7 subway and the LIRR to Flushing as if they were tennis party trains.

With Roger Federer back at No. 1 and coming off a Wimbledon trophy at the ripe old age of 31, the men's side has plenty of excitement -- especially given the competition from Novak Djokovic and Andy Murray (who just bested Federer for Olympic gold in London).

The women's side is a more open field, with fan favorite and recent Wimbledon champ Serena Williams taking on world No. 1 Victoria Azarenka, Maria Sharapova and three-time Open winner Kim Clijsters, who is set to retire once the tournament is over.

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