TENNIS-AUS-OPEN(01 of10)
Open Image ModalFrance\'s Jo-Wilfried Tsonga (L) and Japan\'s Kei Nishikori pose before their men\'s singles on day seven of the 2016 of the Australian Open tennis tournament in Melbourne on January 24, 2016. AFP PHOTO / GREG WOOD -- IMAGE RESTRICTED TO EDITORIAL USE - STRICTLY NO COMMERCIAL USE / AFP / GREG WOOD (Photo credit should read GREG WOOD/AFP/Getty Images) (credit:GREG WOOD via Getty Images)
TENNIS-AUS-OPEN(02 of10)
Open Image ModalJapan\'s Kei Nishikori serves against France\'s Jo-Wilfried Tsonga during their men\'s singles on day seven of the 2016 of the Australian Open tennis tournament in Melbourne on January 24, 2016. AFP PHOTO / GREG WOOD -- IMAGE RESTRICTED TO EDITORIAL USE - STRICTLY NO COMMERCIAL USE / AFP / GREG WOOD (Photo credit should read GREG WOOD/AFP/Getty Images) (credit:GREG WOOD via Getty Images)
Australian Open Tennis(03 of10)
Open Image ModalJo-Wilfried Tsonga of France hits a forehand return to Kei Nishikori of Japan during their fourth round match at the Australian Open tennis championships in Melbourne, Australia, Sunday, Jan. 24, 2016.(AP Photo/Rick Rycroft) (credit:ASSOCIATED PRESS)
Australian Open Tennis(04 of10)
Open Image ModalKei Nishikori of Japan reacts after winning a point against Jo-Wilfried Tsonga of France during their fourth round match at the Australian Open tennis championships in Melbourne, Australia, Sunday, Jan. 24, 2016.(AP Photo/Rick Rycroft) (credit:ASSOCIATED PRESS)
Australian Open Tennis(05 of10)
Open Image ModalKei Nishikori of Japan hits a forehand return to Jo-Wilfried Tsonga of France during their fourth round match at the Australian Open tennis championships in Melbourne, Australia, Sunday, Jan. 24, 2016.(AP Photo/Rick Rycroft) (credit:ASSOCIATED PRESS)
2016 Australian Open - Day 7(06 of10)
Open Image ModalMELBOURNE, AUSTRALIA - JANUARY 24: Kei Nishikori of Japan plays a forehand in his fourth round match against Jo-Wilfried Tsonga of France during day seven of the 2016 Australian Open at Melbourne Park on January 24, 2016 in Melbourne, Australia. (Photo by Mark Kolbe/Getty Images) (credit:Mark Kolbe via Getty Images)
TENNIS-AUS-OPEN(07 of10)
Open Image ModalJapan\'s Kei Nishikori returns against France\'s Jo-Wilfried Tsonga during their men\'s singles on day seven of the 2016 of the Australian Open tennis tournament in Melbourne on January 24, 2016. AFP PHOTO / GREG WOOD -- IMAGE RESTRICTED TO EDITORIAL USE - STRICTLY NO COMMERCIAL USE / AFP / GREG WOOD (Photo credit should read GREG WOOD/AFP/Getty Images) (credit:GREG WOOD via Getty Images)
TENNIS-AUS-OPEN(08 of10)
Open Image ModalSpectators cheer for Japan\'s Kei Nishikori during his men\'s singles match against France\'s Jo-Wilfried Tsonga on day seven of the 2016 Australian Open tennis tournament in Melbourne on January 24, 2016. AFP PHOTO / WILLIAM WEST-- IMAGE RESTRICTED TO EDITORIAL USE - STRICTLY NO COMMERCIAL USE / AFP / WILLIAM WEST (Photo credit should read WILLIAM WEST/AFP/Getty Images) (credit:WILLIAM WEST via Getty Images)
TENNIS-AUS-OPEN(09 of10)
Open Image ModalJapan\'s Kei Nishikori returns against France\'s Jo-Wilfried Tsonga during their men\'s singles on day seven of the 2016 of the Australian Open tennis tournament in Melbourne on January 24, 2016. AFP PHOTO / GREG WOOD -- IMAGE RESTRICTED TO EDITORIAL USE - STRICTLY NO COMMERCIAL USE / AFP / GREG WOOD (Photo credit should read GREG WOOD/AFP/Getty Images) (credit:GREG WOOD via Getty Images)
Australian Open Tennis(10 of10)
Open Image ModalKei Nishikori, right, of Japan is congratulated by Jo-Wilfried Tsonga of France after winning their fourth round match at the Australian Open tennis championships in Melbourne, Australia, Sunday, Jan. 24, 2016.(AP Photo/Rick Rycroft) (credit:ASSOCIATED PRESS)