AUCKLAND, NEW ZEALAND - JANUARY 04: Serena Williams of USA reacts after winning a point in her match against Madison Brengle of USA on day three of the ASB Classic on January 4, 2017 in Auckland, New Zealand. (Photo by Hannah Johnston/Getty Images)
AUCKLAND, NEW ZEALAND - JANUARY 04: Serena Williams of USA reacts after winning a point in her match against Madison Brengle of USA on day three of the ASB Classic on January 4, 2017 in Auckland, New Zealand. (Photo by Hannah Johnston/Getty Images)