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Elina Svitolina of Ukraine attempts to return the ball to Caroline Wozniacki of Denmark during their final women's WTA Tennis Championship match in Dubai on February 25, 2017. Svitolina beat Wozniacki 6-4, 6-2 to win a rain-delayed final, cracking the elite on tenth for the first time as she defeated the 2011 champion, a former world number one seven years ago. / AFP / KARIM SAHIB (Photo credit should read KARIM SAHIB/AFP/Getty Images)

Elina Svitolina of Ukraine attempts to return the ball to Caroline Wozniacki of Denmark during their final women's WTA Tennis Championship match in Dubai on February 25, 2017.
Svitolina beat Wozniacki 6-4, 6-2 to win a rain-delayed final, cracking the elite on tenth for the first time as she defeated the 2011 champion, a former world number one seven years ago. / AFP / KARIM SAHIB        (Photo credit should read KARIM SAHIB/AFP/Getty Images)

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Elina Svitolina of Ukraine attempts to return the ball to Caroline Wozniacki of Denmark during their final women's WTA Tennis Championship match in Dubai on February 25, 2017. Svitolina beat Wozniacki 6-4, 6-2 to win a rain-delayed final, cracking the elite on tenth for the first time as she defeated the 2011 champion, a former world number one seven years ago. / AFP / KARIM SAHIB (Photo credit should read KARIM SAHIB/AFP/Getty Images)

Elina Svitolina of Ukraine attempts to return the ball to Caroline Wozniacki of Denmark during their final women's WTA Tennis Championship match in Dubai on February 25, 2017.
Svitolina beat Wozniacki 6-4, 6-2 to win a rain-delayed final, cracking the elite on tenth for the first time as she defeated the 2011 champion, a former world number one seven years ago. / AFP / KARIM SAHIB        (Photo credit should read KARIM SAHIB/AFP/Getty Images)

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Elina Svitolina of Ukraine attempts to return the ball to Caroline Wozniacki of Denmark during their final women's WTA Tennis Championship match in Dubai on February 25, 2017. Svitolina beat Wozniacki 6-4, 6-2 to win a rain-delayed final, cracking the elite on tenth for the first time as she defeated the 2011 champion, a former world number one seven years ago. / AFP PHOTO / KARIM SAHIB (Photo credit should read KARIM SAHIB/AFP/Getty Images)

Elina Svitolina of Ukraine attempts to return the ball to Caroline Wozniacki of Denmark during their final women's WTA Tennis Championship match in Dubai on February 25, 2017.
Svitolina beat Wozniacki 6-4, 6-2 to win a rain-delayed final, cracking the elite on tenth for the first time as she defeated the 2011 champion, a former world number one seven years ago. / AFP PHOTO / KARIM SAHIB        (Photo credit should read KARIM SAHIB/AFP/Getty Images)

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Elina Svitolina of Ukraine attempts to return the ball to Caroline Wozniacki of Denmark during their final women's WTA Tennis Championship match in Dubai on February 25, 2017. Svitolina beat Wozniacki 6-4, 6-2 to win a rain-delayed final, cracking the elite on tenth for the first time as she defeated the 2011 champion, a former world number one seven years ago. / AFP / KARIM SAHIB (Photo credit should read KARIM SAHIB/AFP/Getty Images)

Elina Svitolina of Ukraine attempts to return the ball to Caroline Wozniacki of Denmark during their final women's WTA Tennis Championship match in Dubai on February 25, 2017.
Svitolina beat Wozniacki 6-4, 6-2 to win a rain-delayed final, cracking the elite on tenth for the first time as she defeated the 2011 champion, a former world number one seven years ago. / AFP / KARIM SAHIB        (Photo credit should read KARIM SAHIB/AFP/Getty Images)

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Caroline Wozniacki of Denmark returns the ball to Elina Svitolina of Ukraine during their final women's WTA Tennis Championship match in Dubai on February 25, 2017. Svitolina beat Wozniacki 6-4, 6-2 to win a rain-delayed final, cracking the elite on tenth for the first time as she defeated the 2011 champion, a former world number one seven years ago. / AFP / KARIM SAHIB (Photo credit should read KARIM SAHIB/AFP/Getty Images)

Caroline Wozniacki of Denmark returns the ball to Elina Svitolina of Ukraine during their final women's WTA Tennis Championship match in Dubai on February 25, 2017.
Svitolina beat Wozniacki 6-4, 6-2 to win a rain-delayed final, cracking the elite on tenth for the first time as she defeated the 2011 champion, a former world number one seven years ago. / AFP / KARIM SAHIB        (Photo credit should read KARIM SAHIB/AFP/Getty Images)