Serena Williams of the United States serves to Vesna Dolonc of Serbia during their second round match at the Australian Open tennis championship in Melbourne, Australia, Wednesday, Jan. 15, 2014.(AP Photo/Aaron Favila)
Serena Williams of the United States makes a forehand return to Vesna Dolonc of Serbia during their second round match at the Australian Open tennis championship in Melbourne, Australia, Wednesday, Jan. 15, 2014.(AP Photo/Aaron Favila)
Serena Williams of the United States makes a forehand return to Vesna Dolonc of Serbia during their second round match at the Australian Open tennis championship in Melbourne, Australia, Wednesday, Jan. 15, 2014.(AP Photo/Aaron Favila)