World Number One Victoria Azarenka of Belarus will today lock horns with Na Li of China in the Women's Singles title clash of the Australian Open Tennis tournament at Melbourne. <br/><br/>In the semi-finals, defending champion Azarenka had defeated Sloane Stephens of the United States, 6-1, 6-4; while sixth seed Li had stunned World Number Two Maria Sharapova of Russia with a straight set, 6-2, 6-2 victory.<br/><br/>In the Men's Singles semi-final yesterday, Britain's Andy Murray defeated World Number Two Roger Federer of Switzerland in a thrilling five set game, 6-4, 6-7, 6-3, 6-7, 6-2. Murray will now face defending champion and World Number One Novak Djokovic of Serbia for the Men's Singles title tomorrow.