MELBOURNE: Defending champion Roger Federer admitted he was lucky to survive a major scare at the Australian Open Wednesday, beating Gilles Simon 6-2, 6-3, 4-6, 4-6, 6-3 in the second round. For a while, it seemed as if Simon, who had beaten Federer in their only two previous meetings, would send the Swiss star packing out of a Grand Slam before the third round for the first time since the French Open in 2003 – a total of 31 majors. But Federer, pumping his fist increasingly in celebration with each point in the final few games, broke Simon's service in the sixth game of the deciding set to go up 4-2, held his service to go up 5-2, then held his serve two games later to clinch it on his fifth match point with an ace. “I remained positive ... it paid off. I got lucky. I'm happy I'm still in the tournament,” Federer said. “I wasn't playing poorly in the third and fourth sets, but Gilles took it to me. Clearly, he's a great player first of all. Matches against him don't come easily ... hopefully we don't play each other anymore!” Simon said he needed “time to get used to (Federer's) game,” which helped him win the third and fourth sets. “It's going fast, he's moving fast, it's just impressive,” Simon said. “There are not too many players able to play to this level.” In other matches, Venus Williams also had some drama getting through to the third round, overcoming a painful injury to beat Sandra Zahlavoa of the Czech Republic 6-7 (6), 6-0, 6-4. Novak Djokovic, Andy Roddick, top-seeded woman Caroline Wozniacki, last year's finalist Justine Henin and 2008 champion Maria Sharapova also advanced. No. 3 Djokovic beat Ivan Dodig 7-5, 6-7 (10), 6-0, 6-2. Djokovic, who beat Jo-Wilfried Tsonga in the 2008 final in Melbourne Park for his only Grand Slam title, is in career-best form. Djokovic will next play his Davis Cup teammate Viktor Troicki after the 29th-seeded player beat Frenchman Nicolas Mahut 6-4, 6-2, 1-6, 6-3. Wozniacki advanced with a 6-1, 6-0 win over American Vania King in the Danish player's first major as No. 1. The 20-year-old reached the third round for a 13th consecutive Grand Slam. To get to the semis, Wozniacki might have to beat seven-time Grand Slam winner Henin, who continued her comeback from injury with a 6-1, 6-3 win over Elena Baltacha of Britain. The pair could meet in the quarterfinals. Henin will have to get through a tough match against two-time major winner Svetlana Kuznetsova just to get past the third round. The 23-seeded Kuznetsova beat Dutch qualifier Arantxa Rus 6-1, 6-4. No. 8 Victoria Azarenka, the 2010 quarterfinalist who lost to Serena Williams each of the past three years, beat Andrea Hlavackova 6-4, 6-4. Serena Williams is injured and not defending her title in Australia. In other matches, Barbora Zahlavova Strycova of the Czech Republic beat Australian wild card Jelena Dokic 7-6 (3), 6-1, and No. 9 Li Na defeated Evgeniya Rodina of Russia 6-3, 6-2. On the men's side, Wimbledon finalist Tomas Berdych needed four match points to beat Philipp Kohlschreiber 4-6, 6-2, 6-3, 6-4, and eighth-seeded Roddick fired his 17th ace to finish off a 7-6 (7), 6-2, 6-3 second-round win over Igor Kunitsyn of Russia. The former No. 1-ranked Roddick is into the third round at Melbourne Park for the ninth straight time. Roddick's US Davis Cup teammate Mardy Fish made a second-round exit, the No. 16 seed losing 1-6, 6-3, 6-3, 6-3 to Tommy Robredo. And ninth-seeded Fernando Verdasco rallied from two sets down to beat Serbia's Janko Tipsarevic 2-6, 4-6, 6-4, 7-6 (0), 6-0, conceding just one point on his serve in the last set.