World Cup 2014 coverage:

Martin Rogers

Power Rankings (Jan. 19): Ana's early slide

Busted Racquet

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.

Men's

(previous rank in parentheses)

1. (1) Andy Murray: Faces Andrei Pavel on Day 2

2. (2) Roger Federer: Overcame Andreas Seppi 6-1, 7-6, 7-5

3. (3) Rafael Nadal: Faces Christophe Rochus on Day 2

4. (4) Novak Djokovic: Fought back in third set to beat Andrea Stoppini 6-2, 6-3, 7-5

5. (-) Andy Roddick: Demolished abysmal Bjorn Rehnquist 6-0, 6-2, 6-2

6. (5) Juan Martin Del Potro: Eased past Mischa Zverev 6-3, 6-4, 6-2

7. (6) Jo-Wilfried Tsonga: Faces Juan Monaco on Day 2

8. (7) David Nalbandian: Survived a test against Marc Gicquel 6-1, 4-6, 6-2, 6-3

Women's

1. (1) Serena Williams: Faces Meng Yuan on Day 2

2. (2) Venus Williams: Faces Angelique Kerber on Day 2

3. (3) Jelena Jankovic: Looked solid and confident in beating Yvonne Meusburger 6-1, 6-3

4. (4) Dinara Safina: Rarely troubled against Alla Kudryavtseva, winning 6-3, 6-4

5. (6) Elena Dementieva: Faces Kristina Barrois on Day 2

6. (7) Caroline Wozniacki: Impressive victory against Shahar Peer 6-3 6-2

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

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