In Photos: Day 2 at the U.S. Open tennis championship
Children wait to get autographs from Roger FedererCarlo Allegri/Reuters
Roger Federer of Switzerland rises in the air as he prepares to hit a smashAdrees Latif/Reuters
Tomas Berdych of the Czech Republic reacts after a return by Bjorn Fratangelo,Matt Rourke/The Associated Press
Thomaz Bellucci of Brazil returns to James WardAFP/Getty Images
Thanasi Kokkinakis of Australia serves to Richard GasquetAdam Hunger/The Associated Press
Donald Young of the United States celebrates defeating Gilles SimonJEWEL SAMAD/AFP / Getty Images
The painted fingernails of Caroline Wozniacki are pictured with U.S. Open themesCarlo Allegri/Reuters
Painted fingernails of Caroline WozniackiCharles Krupa/The Associated Press
Caroline Wozniacki of Denmark returns a shot against Jamie LoebAl Bello/Getty Images
Ivo Karlovic of Croatia hits a return to Federico DelbonisDON EMMERT/Getty Images
Barbora Strycova of Czech Republic falls to the ground against Timea BacsinszkyAlex Goodlett/Getty Images
Angelique Kerber of Germany, returns a shot to Alexandra DulgheruFrank Franklin II/The Associated Press
Johanna Konta of Great Britain serves against Louisa ChiricoClive Brunskill/Getty Images
Timea Bacsinszky of Switzerland serves against Barbora StrycovaAdam Hunger/The Associated Press
Simona Halep of Romania, returns a shot against Marina ErakovicCharles Krupa/The Associated Press
Marina Erakovic of New Zealand returns a shot against Simona HalepCharles Krupa/The Associated Press
Lesia Tsurenko of Ukraine scores a match point against Lucie SafarovaTIMOTHY A. CLARY/AFP / Getty Images
Austin Krajicek of the United States returns a shot against Santiago GiraldoElsa/Getty Images
Yoshihito Nishioka of Japan reactsStreeter Lecka/Getty Images
Simona Halep shown against the backdrop of the USTA Billie Jean King National Tennis Center in New YorkKENA BETANCUR/AFP / Getty Images