Nike's "NYC Street Tennis" Event [Getty Images]

NEW YORK, NY - AUGUST 24: Tennis Players Rafael Nadal, Serena Williams, Madison Keys, Nick Kyrgios, Maria Sharapova, Pete Sampras, Andre Agassi, Genie Bouchard, Roger Federer, Grigor Dimitrov and John McEnroe attends Nike's "NYC Street Tennis" event on August 24, 2015 in New York City. (Photo by Brad Barket/Getty Images)

Getty Images Entertainment Brad Barket