MELBOURNE, Australia – Andy Murray is only one victory away from doing what no British man has done in more than 70 years – win a Grand Slam singles title. Murray beat Marin Cilic 3-6, 6-4, 6-4, 6-2 Thursday night advance to Sunday’s Australian Open final. He’ll take on the winner of Friday night’s semifinal between three-time Australian Open winner Roger Federer and 2008 finalist Jo-Wilfried Tsonga. Serena Williams and Justine Henin won their semifinals over Chinese opponents to advance to Saturday’s final. Williams beat Li Na 7-6 (4), 7-6 (1) while Henin wasted little time beating Zheng Jie 6-1, 6-0. Serena Williams recorded her 50th career win at Melbourne Park and advanced to her fifth Australian Open final. Henin is playing in her first Grand Slam tournament in two years since ending a 20-month retirement. Li and Zheng were the first Chinese players to advance to the semifinals of the same Grand Slam. “Every time I had match points, she came up with some big serves and great shots,” Williams said. “She just goes for broke.” If Federer wins it will mean a rematch of the 2008 U.S. Open where the Swiss star beat Murray in straight sets. That…