Best of Australian Open - Day 4
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Caroline Wozniacki of Denmark kicks a tennis ball in frustration during her women's singles second round match against Victoria Azarenka of Belarus at the Australian Open 2015 tennis tournament in Melbourne
REUTERS - 2/10
David Ferrer of Spain reacts after winning a point against Sergiy Stakhovsky of Ukraine during their men's singles second round match at the Australian Open 2015 tennis tournament in Melbourne
REUTERS - 3/10
Alize Cornet of France (R) shakes hands with Denisa Allertova of the Czech Republic after defeating her in their women's singles second round match at the Australian Open 2015 tennis tournament in Melbourne
REUTERS - 4/10
Djokovic of Serbia puts on a new shirt during his men's singles second round match against Kuznetsov of Russia at the Australian Open 2015 tennis tournament in Melbourne
REUTERS - 5/10
Pospisil of Canada celebrates after defeating Lorenzi of Italy during their men's singles second round match at the Australian Open 2015 tennis tournament in Melbourne
REUTERS - 6/10
Cibulkova of Slovakia shakes hands with Pironkova of Bulgaria after winning their women's singles second round match at the Australian Open 2015 tennis tournament in Melbourne
REUTERS - 7/10
Cibulkova of Slovakia serves to Pironkova of Bulgaria during their women's singles second round match at the Australian Open 2015 tennis tournament in Melbourne
REUTERS - 8/10
Djokovic of Serbia hits a return to Kuznetsov of Russia during their men's singles second round match at the Australian Open 2015 tennis tournament in Melbourne
REUTERS - 9/10
Muguruza of Spain shakes hands with Hantuchova of Slovakia after defeating her in their women's singles second round match at the Australian Open 2015 tennis tournament in Melbourne
REUTERS - 10/10
Nishikori of Japan celebrates after defeating Dodig of Croatia in their men's singles second round match at the Australian Open 2015 tennis tournament in Melbourne
REUTERS
Former world No. 1 Caroline Wozniacki will have to keep waiting for that first Grand Slam title. This year's No. 8 seed fell to Victoria Azarenka in the second round of the Australian Open on Thursday, 6-4, 6-2.
— Danielle Elliot