LOS ANGELES, CA - DECEMBER 12: Madison Keys in action against Maria Sharapova at the Maria Sharapova and Friends tennis exhibition Presented By Porsche on December 12, 2015 in Los Angeles, California. (Photo by Joe Scarnici/Getty Images for IMG)
LOS ANGELES, CA - DECEMBER 12: Madison Keys in action against Maria Sharapova at the Maria Sharapova and Friends tennis exhibition Presented By Porsche on December 12, 2015 in Los Angeles, California. (Photo by Joe Scarnici/Getty Images for IMG)