EN FOTOS: Abierto de Australia 2016

Greece’s Maria Sakkari plays a backhand return during her women’s singles match against China’s Wang Yafan on day one of the 2016 Australian Open tennis tournament in Melbourne on January 18, 2016. AFP PHOTO / WILLIAM WEST-- IMAGE RESTRICTED TO EDITORIAL USE - STRICTLY NO COMMERCIAL USEWILLIAM WEST/AFP/Getty Images ** OUTS - ELSENT, FPG, CM - OUTS * NM, PH, VA if sourced by CT, LA or MoD **  (WILLIAM WEST / AFP/Getty Images)

Japan’s Kei Nishikori reacts as he places an ice pack on his head during his first round match against Germany’s Philipp Kohlschreiber at the Australian Open tennis tournament at Melbourne Park, Australia, January 18, 2016. REUTERS/Issei Kato ** Usable by SD ONLY **  (ISSEI KATO / Reuters Photo)

Serena Williams of the US walks on court during her women’s singles match against Italy’s Camila Giorgi on day one of the 2016 Australian Open tennis tournament in Melbourne on January 18, 2016. AFP PHOTO / SAEED KHAN-- IMAGE RESTRICTED TO EDITORIAL USE - STRICTLY NO COMMERCIAL USESAEED KHAN/AFP/Getty Images ** OUTS - ELSENT, FPG, CM - OUTS * NM, PH, VA if sourced by CT, LA or MoD **  (SAEED KHAN / AFP/Getty Images)

Japan’s Kei Nishikori signs autographs after winning his first round match against Germany’s Philipp Kohlschreiber at the Australian Open tennis tournament at Melbourne Park, Australia, January 18, 2016. REUTERS/Issei Kato ** Usable by SD ONLY **  (ISSEI KATO / Reuters Photo)

Italy’s Camila Giorgi plays a forehand return during her women’s singles match against Serena Williams of the US on day one of the 2016 Australian Open tennis tournament in Melbourne on January 18, 2016. AFP PHOTO / SAEED KHAN-- IMAGE RESTRICTED TO EDITORIAL USE - STRICTLY NO COMMERCIAL USESAEED KHAN/AFP/Getty Images ** OUTS - ELSENT, FPG, CM - OUTS * NM, PH, VA if sourced by CT, LA or MoD **  (SAEED KHAN / AFP/Getty Images)

Italy’s Camila Giorgi plays a backhand return during her women’s singles match against Serena Williams of the US on day one of the 2016 Australian Open tennis tournament in Melbourne on January 18, 2016. AFP PHOTO / SAEED KHAN-- IMAGE RESTRICTED TO EDITORIAL USE - STRICTLY NO COMMERCIAL USESAEED KHAN/AFP/Getty Images ** OUTS - ELSENT, FPG, CM - OUTS * NM, PH, VA if sourced by CT, LA or MoD **  (SAEED KHAN / AFP/Getty Images)

. Melbourne (Australia), 18/01/2016.- Petra Kvitova of the Czech Republic serves against Luksika Kumkhum of Thailand during their first round match on day one of the Australian Open tennis tournament in Melbourne, Australia, 18 January 2016. The Australian Open tennis tournament runs from 18 to 31 January 2016. (Tailandia, Tenis) EFE/EPA/LUKAS COCH AUSTRALIA AND NEW ZEALAND OUT ** Usable by HOY, FL-ELSENT and SD Only **  (LUKAS COCH / EFE)

Japan’s Kei Nishikori throws his towel to a ball boy during his first round match against Germany’s Philipp Kohlschreiber at the Australian Open tennis tournament at Melbourne Park, Australia, January 18, 2016. REUTERS/Issei Kato ** Usable by SD ONLY **  (ISSEI KATO / Reuters Photo)

Water vapour from a fan cools a spectator on day one of the 2016 Australian Open tennis tournament in Melbourne on January 18, 2016. AFP PHOTO / SAEED KHAN-- IMAGE RESTRICTED TO EDITORIAL USE - STRICTLY NO COMMERCIAL USESAEED KHAN/AFP/Getty Images ** OUTS - ELSENT, FPG, CM - OUTS * NM, PH, VA if sourced by CT, LA or MoD **  (SAEED KHAN / AFP/Getty Images)

Czech Republic’s Petra Kvitova serves during her first round match against Thailand’s Luksika Kumkhum at the Australian Open tennis tournament at Melbourne Park, Australia, January 18, 2016. REUTERS/Jason Reed ** Usable by SD ONLY **  (JASON REED / Reuters Photo)

FIS_1577. Melbourne (Australia), 17/01/2016.- Tennis fans cool off in mist sprayed by fans on a hot summer day at the Australian Open tennis tournament in Melbourne, Australia, on 18 January 2016. The Australian Open tennis tournament will go from the 18th of January until the 31st of January 2016 and is Australia’s foremost annual tennis event (Tenis) EFE/EPA/FILIP SINGER ** Usable by HOY, FL-ELSENT and SD Only **  (FILIP SINGER / EFE)

Philipp Kohlschreiber of Germany is airborne as he serves to Kei Nishikori of Japan during their first round match at the Australian Open tennis championships in Melbourne, Australia, Monday, Jan. 18, 2016.(AP Photo/Rick Rycroft)  (Rick Rycroft / AP)

MELBOURNE, AUSTRALIA - JANUARY 18: A general view of the first round match between Phillip Kohlschreiber of Gemany and Kei Nishikori of Japan during day one of the 2016 Australian Open at Melbourne Park on January 18, 2016 in Melbourne, Australia. (Photo by Mark Kolbe/Getty Images) ** OUTS - ELSENT, FPG, CM - OUTS * NM, PH, VA if sourced by CT, LA or MoD **  (Mark Kolbe / Getty Images)

Serena Williams of the United States reacts as she plays Camila Giorgi of Italy during their first round match at the Australian Open tennis championships in Melbourne, Australia, Monday, Jan. 18, 2016.(AP Photo/Vincent Thian)  (Vincent Thian / AP)

MELBOURNE, AUSTRALIA - JANUARY 18: Serena Williams of the United States plays a forehand in her first round match against Camila Giorgi of Italy during day one of the 2016 Australian Open at Melbourne Park on January 18, 2016 in Melbourne, Australia. (Photo by Quinn Rooney/Getty Images) ** OUTS - ELSENT, FPG, CM - OUTS * NM, PH, VA if sourced by CT, LA or MoD **  (Quinn Rooney / Getty Images)