AUCKLAND, NEW ZEALAND - JANUARY 03: Serena Williams of USA serves during her match against Pauline Parmentier of France on day two of the ASB Classic on January 3, 2017 in Auckland, New Zealand. (Photo by Hannah Johnston/Getty Images)
AUCKLAND, NEW ZEALAND - JANUARY 03: Serena Williams of USA serves during her match against Pauline Parmentier of France on day two of the ASB Classic on January 3, 2017 in Auckland, New Zealand. (Photo by Hannah Johnston/Getty Images)