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Power Rankings (Jan. 28): Roger rises, Serena sinks

Busted Racquet

Roger Federer's masterful destruction of Juan Martin Del Potro has lifted the Swiss world No. 2 to the top spot on the Yahoo! Sports Australian Open power rankings.

Rafael Nadal can count himself unfortunate to lose the top spot, as he has yet to drop a set in the tournament. It was impossible, though, to look past Federer's outstanding display at Rod Laver Arena, where he lost only three games in the match against Del Potro.

On the women's side, Serena Williams is bumped from the top position after struggling badly on the way to a third-set victory over Svetlana Kuznetsova.

Elena Dementieva takes her place - and the two women will square off in Thursday's first semifinal.


Men

1. (2) Roger Federer: Magnificent in quarterfinal and looks as good as ever. SF: vs. Andy Roddick.

2. (1) Rafael Nadal: Still hasn't dropped a set and is enjoying the hot conditions. SF: vs. Fernando Verdasco.

3. (3) Fernando Verdasco: Spanish iron man could find Nadal too much to handle. SF: vs. Rafael Nadal.

4. (8) Andy Roddick: Best Slam performance in two years after a winter of hard work. SF: vs. Roger Federer.

Women

1. (2) Elena Dementieva: Olympic champion will like her chances of a first Slam title. SF: vs. Serena Williams.

2. (1) Serena Williams: Fortunate to survive a poor quarterfinal and must improve form. SF: vs. Elena Dementieva.

3. (4) Vera Zvonareva: Sharp and confident and enjoying her furthest Slam run. SF: vs. Dinara Safina.

4. (3) Dinara Safina: Survived a tough quarter and must fix serving demons on big points. SF: vs. Vera Zvonareva.

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