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AUCKLAND, NEW ZEALAND - JANUARY 08: CoCo Vandeweghe of the USA plays a forehand in her quarterfinal match against Barbora Zahlavova Strycova of the Czech Republic during day four of the 2015 ASB Classic at the ASB Tennis Centre on January 8, 2015 in Auckland, New Zealand. (Photo by Phil Walter/Getty Images)

AUCKLAND, NEW ZEALAND - JANUARY 08:  CoCo Vandeweghe of the USA plays a forehand in her quarterfinal match against  Barbora Zahlavova Strycova of the Czech Republic during day four of the 2015 ASB Classic at the ASB Tennis Centre on January 8, 2015 in Auckland, New Zealand.  (Photo by Phil Walter/Getty Images)