WTA Dubai Duty Free Tennis Championship - Day Three [Getty Images]

DUBAI, UNITED ARAB EMIRATES - FEBRUARY 21: Angelique Kerber of Germany in action against Mona Barthel of Germany on day three of the WTA Dubai Duty Free Tennis Championship at the Dubai Tennis Stadium on February 21, 2017 in Dubai, United Arab Emirates. (Photo by Tom Dulat/Getty Images)

Getty Images Sport Tom Dulat