In the Australian Open Tennis, two-time champion Victoria Azarenka today defeated Czech Republic's Barbora Strycova to surge into an Australian Open quarter-final of Women's Singles. The former world number one Belarusian was too strong for the Czech, winning 6-2, 6-4 in the 4th round in Melbourne. She will face seventh seed Angelique Kerber in the quarter-final. Earlier, Kerber defeated fellow German Annika Beck 6-4, 6-0 in the 4th round.Meanwhile, in Men's Singles, the 4th Round match between Swiss player Stan Wawrinka and Canadian Milos Raonic is underway.In another Men's Singles fixtures today, Spaniard David Ferrer will take on American John Isner while Scottish Andy Murray will face Bernard Tomic of Australia.In Women's Doubles, top seed Indo-Swiss duo of Martina Hingis and Sania Mirza will play against Russian – Italian pair of Svetlana Kuznetsova and Roberta Vinci. In Men's doubles, top seed Jean-Julien Rojer and Horia Tecau will take on Italian pair Jean-Julien Marco Cecchinato and Andreas Seppi.World number one Serbian Novak Djokovic and world number three Swiss player Roger Federer have already entered the Men's Singles quarter-finals.