John Isner of the US hits a forehand return during his match against James Ward of Britain at the Kooyong Classic tennis event in Melbourne on January 15, 2015.  Top male players are using the invitational round-robin event as a warm-up to the Australia Open tennis tournament starting January 19.  AFP PHOTO/William WEST --IMAGE RESTRICTED TO EDITORIAL USE - STRICTLY NO COMMERCIAL USE        (Photo credit should read WILLIAM WEST/AFP via Getty Images)