In the Australian Open tennis tournamnet, Roger Federer cruised into his eighth consecutive semi-final with a straight-sets victory over his Swiss teammate Stanislas Wawrinka today in Melbourne.He defeated Wawrinka by 6-1, 6-3, 6-3 in just 1hr 47 min on Rod Laver Arena. Federer will now take on either 2008 champion NovakDjokovic or Czech sixth seed Tomas Berdych in Thursday'sSemi-final. In Women's segment, China's Li Na entered the semi-final after efeating Germany's Andrea Petkovic 6-2, 6-4.She next plays either top seed Caroline Wozniacki of Denmark or Italy's Francesca Schiavone in the semi-finals.