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SINGAPORE - OCTOBER 28: Elina Svitolina of the Ukraine poses with the Billie Jean King Trophy after her win against Sloane Stephens of the United States during the Women's singles final match on Day 8 of the BNP Paribas WTA Finals Singapore presented by SC Global at Singapore Sports Hub on October 28, 2018 in Singapore. (Photo by Clive Brunskill/Getty Images)

SINGAPORE - OCTOBER 28:  Elina Svitolina of the Ukraine poses with the Billie Jean King Trophy after her win against Sloane Stephens of the United States during the Women's singles final match on Day 8 of the BNP Paribas WTA Finals Singapore presented by SC Global at Singapore Sports Hub on October 28, 2018 in Singapore.  (Photo by Clive Brunskill/Getty Images)