In the Australian Open Tennis, Fourth-seeded Agnieszka Radwanska of Poland has advanced to Women's Singles semifinals. She overpowered 10th seeded Spaniard Carla Suarez Navarro 6-1, 6-3 in the opening quarterfinal match in Melbourne this morning. The 2nd quarterfinal between the defending champion and top seed Serena Williams and her regular nemesis Maria Sharapova is underway. Meanwhile, women's doubles quarterfinals between top seeded Indo-Swiss pair of Sania Mirza and Martina Hingis and the German-American pair of Anna-Lena and Coco Vandeweghe is also on. In Men's Singles quarterfinal, 7th seeded Kei Nishikori of Japan will take on world number one, Serbian, Novak Djokovic. The Serbian already holds record five Australian Open titles and is aiming for his sixth. In other quarterfinal fixtures, Swiss giant Roger Federer will face Tomas Berdych of Czech Republic. Federer has not won any Grand Slam titles since 2012 Wimbledon.