GSTAAD, SWITZERLAND - JULY 23: Kiki Bertens (NED) reacts during the Finals of WTA Ladies Championship Gstaad on July 23, 2017 at Roy Emerson Arena in Gstaad, Switzerland. (Photo by Robert Hradil/Icon Sportswire via Getty Images)
GSTAAD, SWITZERLAND - JULY 23: Kiki Bertens (NED) reacts during the Finals of WTA Ladies Championship Gstaad on July 23, 2017 at Roy Emerson Arena in Gstaad, Switzerland. (Photo by Robert Hradil/Icon Sportswire via Getty Images)