In Australian Open, the year's first Grand Slam, defending champions and top seeds Novak Djokovic and Serena Williams advanced to the second round today. World number three Roger Federer of Switzerland, Maria Sharapova of Russia and Jo Wilfred Tsonga of France also advanced to the second round.Others to progress to the second round were Kei Nishikori, Petra Kvitova, Agnieszka Radwanska and Marin Cilic.India's Yuki Bhambri, however, bowed out in the opening round of men's singles. He lost to world number six Tomas Berdych of the Czech Republic, 5-7, 1-6, 2- 6.Sania Mirza will look to carry forward her sparkling run with Martina Hingis in women's doubles. The top seeded Indo-Swiss pair will play its first round match later in the tournament.Leander Paes, Mahesh Bhupathi, Rohan Bopanna and Purav Raja, with their team-mates, will figure in the Men's Doubles.