Security will be tight at the Billie Jean King National Tennis Center in Queens, where the 2013 U.S. Open got under way Monday.
On the men's side, Andy Murray will look to capture his second straight U.S. Open title.
He beat Novak Djokovic in five sets last year for his first ever Grand Slam victory.
Earlier this summer, Murray became the first British man to win Wimbledon in 77 years.
On the women's side, top ranked Serena Williams will look to defend her U.S. Open championship.
Williams defeated Victoria Azarenka last year for her fourth Open title and 15th career Grand Slam.
Last year, 700,000 fans came through the gates to see the final Grand Slam event of the year. It's a yearly tradition for many who like to soak up the electric atmosphere and catch some great tennis.
"I'm looking to see any match, anytime, any day, I just love it," said one tennis fan.
"I love tennis. I love tennis so anything that has to do with tennis is great," said another tennis fan.
Guests will have to go through metal detectors this year but U.S. Open officials say they just want to keep the fans safe.
"Security is pretty important to us so we've been looking at what people have been doing at other sporting events and making sure that the site is as secure as possible. So it'll take a little longer for people to get on the grounds so that's a big priority for us, to make sure that we don't slow the process getting into the grounds," said Billie Jean King National Tennis Center COO Danny Zausner.
This year there are some new additions including a giant social media wall where fans can keep up with the tweets of fellow tennis fans. And of course, there are plenty of places to shop and plenty of food.
Fans are urged to get to the tennis center early and pack light.
For more information, visit usopen.org.