Serena Williams can't call the semi-final

Serena Williams answers questions at a press conference following her quarter-final exit to Sloane Stephens on January 23, 2013
© AP Photos
Serena Williams predicts a close match between Victoria Azarenka and Sloane Stephens in the Australian Open semi-final.

Serena Williams has predicted an "interesting" semi-final between Sloane Stephens and Victoria Azarenka but can not call a winner.

Williams was knocked out by 19-year-old Stephens earlier today, and although anything is possible, the American knows that Azarenka will provide a tough test.

"Well, I think it's interesting," she said. "I think Sloane, she is in the semis now. That gives anyone a chance.

"I think Victoria is playing well. She's defending champion and a fan favourite. She handles the pressure really well, so we'll see."

Williams has struggled with injury throughout the tournament but refused to blame that for her defeat today.

Maria Sharapova waves to the crowd following her quarter-final victory over Ekaterina Makarova on January 22, 2013
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