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SINGAPORE - OCTOBER 19: Coach Darren Cahill and Simona Halep of Romania pose with her Player of the Year award during the Official Draw Ceremony and Gala of the BNP Paribas WTA Finals Singapore presented by SC Global at Marina Bay Sands Hotel on October 19, 2018 in Singapore. (Photo by Matthew Stockman/Getty Images)

SINGAPORE - OCTOBER 19: Coach Darren Cahill and Simona Halep of Romania pose with her Player of the Year award during the Official Draw Ceremony and Gala of the BNP Paribas WTA Finals Singapore presented by SC Global at Marina Bay Sands Hotel on October 19, 2018 in Singapore.  (Photo by Matthew Stockman/Getty Images)

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SINGAPORE - OCTOBER 20: Simona Halep of Romania talks to Andrew Krasny during the Official Draw Ceremony and Gala of the BNP Paribas WTA Finals Singapore presented by SC Global at Marina Bay Sands Hotel on October 20, 2017 in Singapore. (Photo by Matthew Stockman/Getty Images)

SINGAPORE - OCTOBER 20:  Simona Halep of Romania talks to Andrew Krasny during the Official Draw Ceremony and Gala of the BNP Paribas WTA Finals Singapore presented by SC Global at Marina Bay Sands Hotel on October 20, 2017 in Singapore.  (Photo by Matthew Stockman/Getty Images)

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SINGAPORE - OCTOBER 19: Simona Halep of Romania poses on stage with her Player of the Year award with Jennifer Capriati and Steve Simon , CEO and Chairman of the WTA during the Official Draw Ceremony and Gala of the BNP Paribas WTA Finals Singapore presented by SC Global at Marina Bay Sands Hotel on October 19, 2018 in Singapore. (Photo by Matthew Stockman/Getty Images)

SINGAPORE - OCTOBER 19:  Simona Halep of Romania poses on stage with her Player of the Year award with Jennifer Capriati and Steve Simon , CEO and Chairman of the WTA during the Official Draw Ceremony and Gala of the BNP Paribas WTA Finals Singapore presented by SC Global at Marina Bay Sands Hotel on October 19, 2018 in Singapore.  (Photo by Matthew Stockman/Getty Images)

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SINGAPORE - OCTOBER 29: Simona Halep of Romania poses with the WTA Year-End World No.1 Award presented by Dubai Duty Free and Micky Lawler, WTA President during day 8 of the BNP Paribas WTA Finals Singapore presented by SC Global at Singapore Sports Hub on October 29, 2017 in Singapore. (Photo by Julian Finney/Getty Images for WTA)

SINGAPORE - OCTOBER 29:  Simona Halep of Romania poses with the WTA Year-End World No.1 Award presented by Dubai Duty Free and Micky Lawler, WTA President during day 8 of the BNP Paribas WTA Finals Singapore presented by SC Global at Singapore Sports Hub on October 29, 2017 in Singapore.  (Photo by Julian Finney/Getty Images for WTA)