AUCKLAND, NEW ZEALAND - JANUARY 13: John Isner of USA serves to Sam Querrey of USA on day 3 of the ASB Classic on January 13, 2016 in Auckland, New Zealand. (Photo by Fiona Goodall/Getty Images)
AUCKLAND, NEW ZEALAND - JANUARY 13: John Isner of USA serves to Sam Querrey of USA on day 3 of the ASB Classic on January 13, 2016 in Auckland, New Zealand. (Photo by Fiona Goodall/Getty Images)