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Caroline Wozniacki Pictures
SINGAPORE - OCTOBER 23: (EDITORS NOTE: Image has been converted to black and white.) Caroline Wozniacki of Denmark warms up back stage with her coach Piortr Wozniacki during a prior to her singles match with Petra Kvitova of the Czech Republic prior to their singles match during day 3 of the BNP Paribas WTA Finals Singapore presented by SC Global at Singapore Sports Hub on October 23, 2018 in Singapore. at Singapore Sports Hub on October 23, 2018 in Singapore. (Photo by Clive Brunskill/Getty Images)