Players take to Twitter ahead of Open

Novak Djokovic

Oh, nothing. Just giving a speech at the United Nations:

Rafael Nadal

Out for a little stroll in the city:

Andy Murray

The calm before the storm:

Roger Federer

Hanging out with FOX Sports Live's (and, of course, former tennis great) Andy Roddick:

Tomas Berdych

Having fun with Photoshop:

John Isner

America's No. 1 is a little preoccupied:

Milos Raonic

A nice view for the No. 10 seed:

Serena Williams

The world's No. 1 is not kidding around:

Victoria Azarenka

Hanging out on the observation deck of the Empire State Building with the great Billie Jean King:

Caroline Wozniacki

Facing stiff competition at the warm-up event in New Haven:

Petra Kvitova

Speaking of Yale, the women's No. 7 seed found time to check out the campus:

Ana Ivanovic

Hanging in Central Park with her brother:

Maria Sharapova

She won't be playing in the tournament, but she won't leave New York without having at least a little fun: