MELBOURNE, AUSTRALIA - JANUARY 17:  Ivo Karlovic of Croatia celebrates winning match point in his first round match against Horacio Zeballos of Argentina on day two of the 2017 Australian Open at Melbourne Park on January 17, 2017 in Melbourne, Australia. Karlovic and Horacio Zeballos produced the longest match in Australian Open history before the Croatian finally triumphed 6-7, 3-6, 7-5, 6-2, 22-20.  (Photo by Scott Barbour/Getty Images)