Half the field was in action on the opening day of the Australian Open and there were a handful of changes from the pre-tournament Yahoo! Sports power rankings.
Andy Roddick's dominant display pushed him from outside the top eight and into fifth position, knocking Marin Cilic off the list. Meanwhile, Ana Ivanovic's shaky form dropped her two spots in spite of victory, while Vera Zvonareva forced her way onto the list for the first time.
(previous rank in parentheses)
5. (-) Andy Roddick: Demolished abysmal Bjorn Rehnquist 6-0, 6-2, 6-2
8. (7) David Nalbandian: Survived a test against Marc Gicquel 6-1, 4-6, 6-2, 6-3
7. (5) Ana Ivanovic: Survived error-prone afternoon to beat Julia Goerges 7-5, 6-3
8. (-) Vera Zvonareva: Finished strong against Magdalena Rybarikova to win 7-6, 6-0