Caroline Wozniacki of Denmark makes a forehand return to Karolina Pliskova of the Czech Republic during her singles semifinal match at the WTA tennis tournament in Singapore, on Saturday, Oct. 28, 2017. (AP Photo/Yong Teck Lim)

Caroline Wozniacki of Denmark makes a forehand return to Karolina Pliskova of the Czech Republic during her singles semifinal match at the WTA tennis tournament in Singapore, on Saturday, Oct. 28, 2017. (AP Photo/Yong Teck Lim)

 Karolina Pliskova of the Czech Republic reacts after conceding a point to Caroline Wozniacki of Denmark during her singles semifinal match at the WTA tennis tournament in Singapore, on Saturday, Oct. 28, 2017. (AP Photo/Yong Teck Lim)

Karolina Pliskova of the Czech Republic reacts after conceding a point to Caroline Wozniacki of Denmark during her singles semifinal match at the WTA tennis tournament in Singapore, on Saturday, Oct. 28, 2017. (AP Photo/Yong Teck Lim)

 Caroline Wozniacki of Denmark serves the ball to Karolina Pliskova of the Czech Republic during her singles semifinal match at the WTA tennis tournament in Singapore, on Saturday, Oct. 28, 2017. (AP Photo/Yong Teck Lim)

Caroline Wozniacki of Denmark serves the ball to Karolina Pliskova of the Czech Republic during her singles semifinal match at the WTA tennis tournament in Singapore, on Saturday, Oct. 28, 2017. (AP Photo/Yong Teck Lim)

 Timea Babos of Hungary, as she pairs up with partner Andrea Hlavackova of the Czech Republic, takes off her shoe after sustaining a left ankle injury during their doubles semifinal match against Martina Hingis of Switzerland and Chan Yung-Jan of Taiwan at the WTA tennis tournament in Singapore, on Saturday, Oct. 28, 2017. (AP Photo/Yong Teck Lim)

Timea Babos of Hungary, as she pairs up with partner Andrea Hlavackova of the Czech Republic, takes off her shoe after sustaining a left ankle injury during their doubles semifinal match against Martina Hingis of Switzerland and Chan Yung-Jan of Taiwan at the WTA tennis tournament in Singapore, on Saturday, Oct. 28, 2017. (AP Photo/Yong Teck Lim)

 Venus Williams of the United States serves the ball to Caroline Garcia of France during their semifinal match at the WTA tennis tournament in Singapore, on Saturday, Oct. 28, 2017. (AP Photo/Yong Teck Lim)

Venus Williams of the United States serves the ball to Caroline Garcia of France during their semifinal match at the WTA tennis tournament in Singapore, on Saturday, Oct. 28, 2017. (AP Photo/Yong Teck Lim)

 Venus Williams of the United States celebrates after beating Caroline Garcia of France during their semifinal match at the WTA tennis tournament in Singapore, on Saturday, Oct. 28, 2017. (AP Photo/Yong Teck Lim)

Venus Williams of the United States celebrates after beating Caroline Garcia of France during their semifinal match at the WTA tennis tournament in Singapore, on Saturday, Oct. 28, 2017. (AP Photo/Yong Teck Lim)

 Andrea Hlavackova of the Czech Republic, right, and Timea Babos of Hungary celebrate after beating Kiki Bertens of the Netherlands and Johanna Larsson of Sweden during their doubles final match at the WTA tennis tournament in Singapore, on Sunday, Oct. 29, 2017. (AP Photo/Yong Teck Lim)

Andrea Hlavackova of the Czech Republic, right, and Timea Babos of Hungary celebrate after beating Kiki Bertens of the Netherlands and Johanna Larsson of Sweden during their doubles final match at the WTA tennis tournament in Singapore, on Sunday, Oct. 29, 2017. (AP Photo/Yong Teck Lim)

 Venus Williams of the United States makes a forehand return against Caroline Wozniacki of Denmark during their singles final match at the WTA tennis tournament in Singapore, on Sunday, Oct. 29, 2017. (AP Photo/Yong Teck Lim)

Venus Williams of the United States makes a forehand return against Caroline Wozniacki of Denmark during their singles final match at the WTA tennis tournament in Singapore, on Sunday, Oct. 29, 2017. (AP Photo/Yong Teck Lim)

 Caroline Wozniacki of Denmark makes a forehand return against Venus Williams of the United States during their singles final match at the WTA tennis tournament in Singapore, on Sunday, Oct. 29, 2017. (AP Photo/Yong Teck Lim)

Caroline Wozniacki of Denmark makes a forehand return against Venus Williams of the United States during their singles final match at the WTA tennis tournament in Singapore, on Sunday, Oct. 29, 2017. (AP Photo/Yong Teck Lim)

 Venus Williams of the United States prepares to return the ball against Caroline Wozniacki of Denmark during their singles final match at the WTA tennis tournament in Singapore, on Sunday, Oct. 29, 2017. (AP Photo/Yong Teck Lim)

Venus Williams of the United States prepares to return the ball against Caroline Wozniacki of Denmark during their singles final match at the WTA tennis tournament in Singapore, on Sunday, Oct. 29, 2017. (AP Photo/Yong Teck Lim)

 Caroline Wozniacki of Denmark celebrates after beating Venus Williams of the United States during their singles final match at the WTA tennis tournament in Singapore, on Sunday, Oct. 29, 2017. (AP Photo/Yong Teck Lim)

Caroline Wozniacki of Denmark celebrates after beating Venus Williams of the United States during their singles final match at the WTA tennis tournament in Singapore, on Sunday, Oct. 29, 2017. (AP Photo/Yong Teck Lim)

 Caroline Wozniacki of Denmark celebrates after beating Venus Williams of the United States during their singles final match at the WTA tennis tournament in Singapore, on Sunday, Oct. 29, 2017. (AP Photo/Yong Teck Lim)

Caroline Wozniacki of Denmark celebrates after beating Venus Williams of the United States during their singles final match at the WTA tennis tournament in Singapore, on Sunday, Oct. 29, 2017. (AP Photo/Yong Teck Lim)

 Venus Williams of the United States reacts with her runner-up trophy after conceding her singles final match to Caroline Wozniacki of Denmark at the WTA tennis tournament in Singapore, on Sunday, Oct. 29, 2017. (AP Photo/Yong Teck Lim)

Venus Williams of the United States reacts with her runner-up trophy after conceding her singles final match to Caroline Wozniacki of Denmark at the WTA tennis tournament in Singapore, on Sunday, Oct. 29, 2017. (AP Photo/Yong Teck Lim)

 Caroline Wozniacki of Denmark lifts the winner's trophy after beating Venus Williams of the United States during their singles final match at the WTA tennis tournament in Singapore, on Sunday, Oct. 29, 2017. (AP Photo/Yong Teck Lim)

Caroline Wozniacki of Denmark lifts the winner's trophy after beating Venus Williams of the United States during their singles final match at the WTA tennis tournament in Singapore, on Sunday, Oct. 29, 2017. (AP Photo/Yong Teck Lim)

 Caroline Wozniacki of Denmark kisses the winner's trophy after beating Venus Williams of the United States during their singles final match at the WTA tennis tournament in Singapore, on Sunday, Oct. 29, 2017. (AP Photo/Yong Teck Lim)

Caroline Wozniacki of Denmark kisses the winner's trophy after beating Venus Williams of the United States during their singles final match at the WTA tennis tournament in Singapore, on Sunday, Oct. 29, 2017. (AP Photo/Yong Teck Lim)

 Caroline Wozniacki of Denmark makes a forehand return to Karolina Pliskova of the Czech Republic during her singles semifinal match at the WTA tennis tournament in Singapore, on Saturday, Oct. 28, 2017. (AP Photo/Yong Teck Lim)
 Karolina Pliskova of the Czech Republic reacts after conceding a point to Caroline Wozniacki of Denmark during her singles semifinal match at the WTA tennis tournament in Singapore, on Saturday, Oct. 28, 2017. (AP Photo/Yong Teck Lim)
 Caroline Wozniacki of Denmark serves the ball to Karolina Pliskova of the Czech Republic during her singles semifinal match at the WTA tennis tournament in Singapore, on Saturday, Oct. 28, 2017. (AP Photo/Yong Teck Lim)
 Timea Babos of Hungary, as she pairs up with partner Andrea Hlavackova of the Czech Republic, takes off her shoe after sustaining a left ankle injury during their doubles semifinal match against Martina Hingis of Switzerland and Chan Yung-Jan of Taiwan at the WTA tennis tournament in Singapore, on Saturday, Oct. 28, 2017. (AP Photo/Yong Teck Lim)
 Venus Williams of the United States serves the ball to Caroline Garcia of France during their semifinal match at the WTA tennis tournament in Singapore, on Saturday, Oct. 28, 2017. (AP Photo/Yong Teck Lim)
 Venus Williams of the United States celebrates after beating Caroline Garcia of France during their semifinal match at the WTA tennis tournament in Singapore, on Saturday, Oct. 28, 2017. (AP Photo/Yong Teck Lim)
 Andrea Hlavackova of the Czech Republic, right, and Timea Babos of Hungary celebrate after beating Kiki Bertens of the Netherlands and Johanna Larsson of Sweden during their doubles final match at the WTA tennis tournament in Singapore, on Sunday, Oct. 29, 2017. (AP Photo/Yong Teck Lim)
 Venus Williams of the United States makes a forehand return against Caroline Wozniacki of Denmark during their singles final match at the WTA tennis tournament in Singapore, on Sunday, Oct. 29, 2017. (AP Photo/Yong Teck Lim)
 Caroline Wozniacki of Denmark makes a forehand return against Venus Williams of the United States during their singles final match at the WTA tennis tournament in Singapore, on Sunday, Oct. 29, 2017. (AP Photo/Yong Teck Lim)
 Venus Williams of the United States prepares to return the ball against Caroline Wozniacki of Denmark during their singles final match at the WTA tennis tournament in Singapore, on Sunday, Oct. 29, 2017. (AP Photo/Yong Teck Lim)
 Caroline Wozniacki of Denmark celebrates after beating Venus Williams of the United States during their singles final match at the WTA tennis tournament in Singapore, on Sunday, Oct. 29, 2017. (AP Photo/Yong Teck Lim)
 Caroline Wozniacki of Denmark celebrates after beating Venus Williams of the United States during their singles final match at the WTA tennis tournament in Singapore, on Sunday, Oct. 29, 2017. (AP Photo/Yong Teck Lim)
 Venus Williams of the United States reacts with her runner-up trophy after conceding her singles final match to Caroline Wozniacki of Denmark at the WTA tennis tournament in Singapore, on Sunday, Oct. 29, 2017. (AP Photo/Yong Teck Lim)
 Caroline Wozniacki of Denmark lifts the winner's trophy after beating Venus Williams of the United States during their singles final match at the WTA tennis tournament in Singapore, on Sunday, Oct. 29, 2017. (AP Photo/Yong Teck Lim)
 Caroline Wozniacki of Denmark kisses the winner's trophy after beating Venus Williams of the United States during their singles final match at the WTA tennis tournament in Singapore, on Sunday, Oct. 29, 2017. (AP Photo/Yong Teck Lim)

Caroline Wozniacki of Denmark makes a forehand return to Karolina Pliskova of the Czech Republic during her singles semifinal match at the WTA tennis tournament in Singapore, on Saturday, Oct. 28, 2017. (AP Photo/Yong Teck Lim)

Karolina Pliskova of the Czech Republic reacts after conceding a point to Caroline Wozniacki of Denmark during her singles semifinal match at the WTA tennis tournament in Singapore, on Saturday, Oct. 28, 2017. (AP Photo/Yong Teck Lim)

Caroline Wozniacki of Denmark serves the ball to Karolina Pliskova of the Czech Republic during her singles semifinal match at the WTA tennis tournament in Singapore, on Saturday, Oct. 28, 2017. (AP Photo/Yong Teck Lim)

Timea Babos of Hungary, as she pairs up with partner Andrea Hlavackova of the Czech Republic, takes off her shoe after sustaining a left ankle injury during their doubles semifinal match against Martina Hingis of Switzerland and Chan Yung-Jan of Taiwan at the WTA tennis tournament in Singapore, on Saturday, Oct. 28, 2017. (AP Photo/Yong Teck Lim)

Venus Williams of the United States serves the ball to Caroline Garcia of France during their semifinal match at the WTA tennis tournament in Singapore, on Saturday, Oct. 28, 2017. (AP Photo/Yong Teck Lim)

Venus Williams of the United States celebrates after beating Caroline Garcia of France during their semifinal match at the WTA tennis tournament in Singapore, on Saturday, Oct. 28, 2017. (AP Photo/Yong Teck Lim)

Andrea Hlavackova of the Czech Republic, right, and Timea Babos of Hungary celebrate after beating Kiki Bertens of the Netherlands and Johanna Larsson of Sweden during their doubles final match at the WTA tennis tournament in Singapore, on Sunday, Oct. 29, 2017. (AP Photo/Yong Teck Lim)

Venus Williams of the United States makes a forehand return against Caroline Wozniacki of Denmark during their singles final match at the WTA tennis tournament in Singapore, on Sunday, Oct. 29, 2017. (AP Photo/Yong Teck Lim)

Caroline Wozniacki of Denmark makes a forehand return against Venus Williams of the United States during their singles final match at the WTA tennis tournament in Singapore, on Sunday, Oct. 29, 2017. (AP Photo/Yong Teck Lim)

Venus Williams of the United States prepares to return the ball against Caroline Wozniacki of Denmark during their singles final match at the WTA tennis tournament in Singapore, on Sunday, Oct. 29, 2017. (AP Photo/Yong Teck Lim)

Caroline Wozniacki of Denmark celebrates after beating Venus Williams of the United States during their singles final match at the WTA tennis tournament in Singapore, on Sunday, Oct. 29, 2017. (AP Photo/Yong Teck Lim)

Caroline Wozniacki of Denmark celebrates after beating Venus Williams of the United States during their singles final match at the WTA tennis tournament in Singapore, on Sunday, Oct. 29, 2017. (AP Photo/Yong Teck Lim)

Venus Williams of the United States reacts with her runner-up trophy after conceding her singles final match to Caroline Wozniacki of Denmark at the WTA tennis tournament in Singapore, on Sunday, Oct. 29, 2017. (AP Photo/Yong Teck Lim)

Caroline Wozniacki of Denmark lifts the winner's trophy after beating Venus Williams of the United States during their singles final match at the WTA tennis tournament in Singapore, on Sunday, Oct. 29, 2017. (AP Photo/Yong Teck Lim)

Caroline Wozniacki of Denmark kisses the winner's trophy after beating Venus Williams of the United States during their singles final match at the WTA tennis tournament in Singapore, on Sunday, Oct. 29, 2017. (AP Photo/Yong Teck Lim)

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