Number one-ranked Caroline Wozniacki takes on defending champion Kim Clijsters for a place in the Australian Open semi-finals ... Andy Murray is wary of the "deceptive" power of Japanese 24th seed Kei Nishikori ahead of their Australian Open quarter-final ... MELBOURNE (Reuters) - Third seed Victoria Azarenka roared back from a set down to beat Agnieszka Radwanska 6-7 6-0 6-2 and reach the semi-finals of the Australian Open on Tuesday ... MELBOURNE (Reuters) - Caroline Wozniacki was knocked out of the Australian Open by big-hitting Belgian Kim Clijsters Tuesday, ensuring the women's game will have a new number one by the end of the year's first grand slam ... MELBOURNE (Reuters) - Roger Federer toppled Argentine giant Juan Martin Del Potro 6-4 6-3 6-2 with some exquisite shot-making to reach the semi-finals of the Australian Open on Tuesday ... MELBOURNE (Reuters) - A fired-up Rafa Nadal survived a huge scare from big-hitting Czech Tomas Berdych at the Australian Open on Tuesday to prevail 6-7 7-6 6-4 6-3 and set up a mouthwatering semi-final with great rival Roger Federer ... MELBOURNE (Reuters) - David Ferrer has moved almost unnoticed into the quarter-finals of the Australian Open but world number one Novak Djokovic knows the serious threat the Spaniard will pose Wednesday ... Roger Federer impressively beats Juan Martin Del Potro 6-4 6-3 6-2 ... | 
