BNP Paribas WTA Finals: Singapore 2016 - Day Seven [Getty Images]

SINGAPORE - OCTOBER 29: Angelique Kerber of Germany plays a forehand in her singles semi-final match against Agnieszka Radwanska of Poland during day 7 of the BNP Paribas WTA Finals Singapore at Singapore Sports Hub on October 29, 2016 in Singapore. (Photo by Julian Finney/Getty Images)

Getty Images Sport Julian Finney