In the mens tennis Novak Djokovic beat Kyle Edmund in straight sets, No. 24 Lucas Pouille outlasted two-time U.S. Open champion Rafael Nadal in five sets, No. 9 Jo-Wilfried Tsonga defeated No. 26 Jack Sock in four sets, and No. 10 Gael Monfils beat Marcos Baghdatis in straight sets.
In the women’s rounds No. 2 Angelique Kerber topped No. 14 Petra Kvitova, No. 7 Roberta Vinci beat Lesia Tsurenko, Caroline Wozniacki defeated No. 8 Madison Keys and unseeded Anastasija Sevastova upset No. 13 Johanna Konta, all in straight sets.
But the celebrities were there to cheer people on.
But first Mary Kate competed in The Hampton Horse Show.
Prior to the US Open Bill Clinton made a surprise appearance at the Made in America festival in Philadelphia with Beyoncé and Jay Z.