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AUCKLAND, NEW ZEALAND - JANUARY 15: David Ferrer of Spain plays a forehand during his semi final match against Jack Sock of USA during day five of the 2016 ASB Classic at the ASB Tennis Arena on January 15, 2016 in Auckland, New Zealand. (Photo by Hannah Peters/Getty Images)

AUCKLAND, NEW ZEALAND - JANUARY 15:  David Ferrer of Spain plays a forehand during his semi final match against Jack Sock of USA during day five of the 2016 ASB Classic at the ASB Tennis Arena on January 15, 2016 in Auckland, New Zealand.  (Photo by Hannah Peters/Getty Images)