Justine Henin will face defending champion Serena Williams in the final of the Australian Open after both women won their semi-finals in straight sets.Williams reached her fifth Melbourne final with a hard-fought win over China's Li Na in the day's first match 7-6 (7-4) 7-6 (7-1).Wildcard Justine Henin thrashed the unseeded Zheng Jie 6-1 6-0.In the Men's section, Frenchman Jo-Wilfried Tsonga will meet Swiss star Roger Federer, while fifth-seeded Andy Murray of Britain faces 14th seeded Croat Marin Cilic on Friday.