Maria Sharapova of Russia serves to Karin Knapp of Italy during their second round match at the Australian Open tennis championship in Melbourne, Australia, Thursday, Jan. 16, 2014.(AP Photo/Aaron Favila)
Maria Sharapova of Russia reacts during her second round match against Karin Knapp of Italy at the Australian Open tennis championship in Melbourne, Australia, Thursday, Jan. 16, 2014.(AP Photo/Aaron Favila)