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SINGAPORE - OCTOBER 27: Yaroslava Shvedova (R) of Kazakhstan and Timea Babos of Hungary celebrate in their doubles match against Bethanie Mattek-Sands of the United States and Lucie Safarova of Czech Republic during day 5 of the BNP Paribas WTA Finals Singapore at Singapore Sports Hub on October 27, 2016 in Singapore. (Photo by Clive Brunskill/Getty Images)

SINGAPORE - OCTOBER 27:  Yaroslava Shvedova (R) of Kazakhstan and Timea Babos of Hungary celebrate in their doubles match against Bethanie Mattek-Sands of the United States and Lucie Safarova of Czech Republic during day 5 of the BNP Paribas WTA Finals Singapore at Singapore Sports Hub on October 27, 2016 in Singapore.  (Photo by Clive Brunskill/Getty Images)

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SINGAPORE - OCTOBER 27: Timea Babos (R) of Hungary and Yaroslava Shvedova of Kazakhstan celebrate in their doubles match against Bethanie Mattek-Sands of the United States and Lucie Safarova of Czech Republic during day 5 of the BNP Paribas WTA Finals Singapore at Singapore Sports Hub on October 27, 2016 in Singapore. (Photo by Clive Brunskill/Getty Images)

SINGAPORE - OCTOBER 27: Timea Babos (R) of Hungary and Yaroslava Shvedova of Kazakhstan celebrate in their doubles match against Bethanie Mattek-Sands of the United States and Lucie Safarova of Czech Republic during day 5 of the BNP Paribas WTA Finals Singapore at Singapore Sports Hub on October 27, 2016 in Singapore.  (Photo by Clive Brunskill/Getty Images)

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SINGAPORE - OCTOBER 27: Yaroslava Shvedova (L) of Kazakhstan and Timea Babos of Hungary talk in their doubles match against Bethanie Mattek-Sands of the United States and Lucie Safarova of Czech Republic during day 5 of the BNP Paribas WTA Finals Singapore at Singapore Sports Hub on October 27, 2016 in Singapore. (Photo by Julian Finney/Getty Images)

SINGAPORE - OCTOBER 27:  Yaroslava Shvedova (L) of Kazakhstan and Timea Babos of Hungary talk in their doubles match against Bethanie Mattek-Sands of the United States and Lucie Safarova of Czech Republic during day 5 of the BNP Paribas WTA Finals Singapore at Singapore Sports Hub on October 27, 2016 in Singapore.  (Photo by Julian Finney/Getty Images)

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SINGAPORE - OCTOBER 27: Timea Babos (L) of Hungary and Yaroslava Shvedova of Kazakhstan in action in their doubles match against Bethanie Mattek-Sands of the United States and Lucie Safarova of Czech Republic during day 5 of the BNP Paribas WTA Finals Singapore at Singapore Sports Hub on October 27, 2016 in Singapore. (Photo by Julian Finney/Getty Images)

SINGAPORE - OCTOBER 27:  Timea Babos (L) of Hungary and Yaroslava Shvedova of Kazakhstan in action in their doubles match against Bethanie Mattek-Sands of the United States and Lucie Safarova of Czech Republic during day 5 of the BNP Paribas WTA Finals Singapore at Singapore Sports Hub on October 27, 2016 in Singapore.  (Photo by Julian Finney/Getty Images)

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SINGAPORE - OCTOBER 27: Lucie Safarova (R) of Czech Republic and Bethanie Mattek-Sands of the United States celebrate victory in their doubles match against Yaroslava Shvedova of Kazakhstan and Timea Babos of Hungary during day 5 of the BNP Paribas WTA Finals Singapore at Singapore Sports Hub on October 27, 2016 in Singapore. (Photo by Julian Finney/Getty Images)

SINGAPORE - OCTOBER 27:  Lucie Safarova (R) of Czech Republic and Bethanie Mattek-Sands of the United States celebrate victory in their doubles match against Yaroslava Shvedova of Kazakhstan and Timea Babos of Hungary during day 5 of the BNP Paribas WTA Finals Singapore at Singapore Sports Hub on October 27, 2016 in Singapore.  (Photo by Julian Finney/Getty Images)