MELBOURNE (AFP) Justine Henin capped her amazing comeback by storming into the Australian Open final on Thursday where she will meet the imposing Serena Williams who is gunning for a fifth title. Fifth seed Andy Murray also booked his place in the decider, becoming the first British player since John Lloyd in 1977 to get this far in Melbourne when he ditched weary 14th seeded Croatian Marin Cilic 3-6, 6-4, 6-4, 6-2. World number one Roger Federer takes on French 10th seed Jo-Wilfried Tsonga in the second semi-final on Friday. The tenacious Henin is playing her first Grand Slam since coming out of an 18-month retirement and kept her historic run going with a 6-1, 6-0 demolition of unseeded Chinese Zheng Jie. Williams also had to negotiate Chinese opposition and was made to work hard by 16th seed Li Na before grinding her down 7-6 (7/4), 7-6 (7/1) under a hot sun on the Rod Laver Arena to set up an enticing final on Saturday. Scotlands Murray is attempting to become the first Briton to win a Grand Slam since Fred Perry in 1936 and he jumped all over weary Cilic after losing the opening set his first dropped set of the tournament. Marin showed incredible guts, he had played three five-setters here. He made it so tough for me and he was so clearly tired after his hard week, said the 22-year-old. After losing the first set I just went for my shots. Looking ahead to Sundays final, Murray said he would need to be at the top of his game, whether he played Federer or Tsonga. Its important to play solid against either of them, maintain my level and not play silly tennis. Ever since she announced her return to tennis the talk has been about whether Henin could emulate Belgian compatriot Kim Clijsters, who won last years US Open on her own comeback. And the former world number one has lived up to expectations after being handed a wildcard by organisers. She destroyed Zheng as she stayed on track to add to her seven Grand Slam titles, including the 2004 Australian Open. The dream continues. I am going to play the number one and defending champion, said the 27-year-old, who became the first wildcard to reach the final here. Henin has negotiated some tough opposition to get this far, including fifth seed Elena Dementieva, 19th seed Nadia Petrova and talented Belgian Yanina Wickmayer. But the biggest test of her comeback will come in the form of Williams, who is angling for a 12th Grand Slam title to put her alongside Billie Jean King. She saw off Li in just over two hours, with the rising Chinese star saving four match points before a delighted Williams clinched the win with an ace. I am happy I was able to pull it out, it was really close, said Williams. I wasnt at my best today, but Im still here which is shocking and Im just going to do whatever I can to stay. The world number one is also hoping to become the first player to successfully defend her Australian title since American Jennifer Capriati in 2002. But Williams was made to fight hard against a determined Li, who was not overawed by playing in her first Grand Slam semi-final. She pushed Williams all the way and learned a lot from playing such a high-profile game. I lost the match and I was a little bit sad to be stopped in the semi-final, but I played good tennis today, said Li.