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

SINGAPORE - OCTOBER 23: Madison Keys of the United States serves in her singles match against Simona Halep of Romania during day 1 of the BNP Paribas WTA Finals Singapore at Singapore Sports Hub on October 23, 2016 in Singapore. (Photo by Clive Brunskill/Getty Images)

Getty Images Sport Clive Brunskill