By John Pye, The Associated Press MELBOURNE, Australia — Roger Federer relaxed into the chair, his arms folded across his chest in a casual, confident way, and just savored a vintage Australian Open performance. The 17-time Grand Slam champion, seeded a lowly-by-his-standards 17th after spending six months on the sidelines to let his left knee heal, only needed 90 minutes to beat Tomas Berdych 6-2, 6-4, 6-4 in the third round on Friday. This was against a highly-credentialed pro, seeded No.