In Australian Open Tennis, world number one and defending champion Novak Djokovic will clash with third seed Roger Federer in the semi-finals today. Both players have met 44 times in the past, and each have won equal number of matches. The winner of today's match will, in the final, take on the victor of the other semi-final between world number two Andy Murray and Milos Raonic.In the Women's semi-finals, world number one Serena Williams will be up against fourth seed Agnieszka Radwanska, while Angelique Kerber will meet Johanna Konta. Sania Mirza and Martina Hingis, who advanced to the Women's Doubles Final yesterday, will face each other in the Mixed Doubles quarter-finals today. Sania and her team-mate Ivan Dodig are the top seeds in Mixed Doubles, while Hingis has been paired with Leander Paes.