The W Washington D.C. rooftop was the hard court on July 28, hosting WTA and ATP tennis celebrities and VIPs. The 2013 Citi Open Player Party opened the P.O.V. rooftop terrace and lounge for guests to get excited about the Citi Open tournament, which began earlier that day. Juan Martin Del Potro, the seventh-ranked player in the world, was among the hundreds of players in attendance. Mayor Vincent Gray was among D.C.-ers mixing and mingling with players. The Citi Open is a part of the Emirates Airlines U.S. Open Series, leading up to the U.S. Open.