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Rankings news: Oudin, Del Potro tumble; Youzhny rises

Chris Chase
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The post-Grand Slam rankings are always a bit of a jumble thanks to the large amount of points up for grabs for players. It's a simple formula: underperform last year's result and you plummet in the rankings, overperform and make a huge leap. Here's a look at some of the biggest post-U.S. Open moves:

Big drops

Melanie Oudin -- No. 43 to No. 74 -- The Oudin freefall had been expected all summer, the result of a disappointing year and the erasing of all the points she accumulated during that magical quarterfinal run at the 2009 Open. This is a big deal for Oudin, who will now have to enter qualifying for big non-Slam events.

Juan Martin del Potro -- No. 10 to No. 34 -- Del Potro is expected to return to the tour this fall but even if he does, his ranking likely isn't done bottoming out yet. He'll be unable to defend the 800 points he earned for his finals appearances at the World Tour Finals last year. Unless he comes back with a vengeance, his ranking could slip to the lower reaches of the top 100. Unlike Oudin though, he won't have to worry about getting into tournament because of that.

Fernando Gonzalez -- No. 29 to No. 54 -- Six months ago, the Chilean was in the top 10. An injury derailed his summer though. He's only won two matches since March.

Kateryna Bondarenko -- No. 59 to No. 92 -- The Ukranian had a similar situation to Oudin: quarterfinals to second round.

Big leaps

Vera Zvonareva -- No. 8 to No. 4 -- Making back-to-back Grand Slam finals tends to have a positive effect on one's ranking.

Mikhail Youzhny -- No. 14 to No. 9 -- What's more surprising: that Youzhny is all the way up to No. 9 or that it's not the highest ranking of his career (he made it to No. 8 after a solid end to 2007 and a quarterfinal run at next year's Aussie Open)? It's definitely the latter.

Richard Gasquet -- No. 38 to No. 29 -- Gasquet continues his long, post-cocaine-kiss climb back to the upper-reaches of the rankings.

Dominika Cibulkova -- No. 45 to No. 33 -- She may not be great at target practice, but the Slovakian is getting back on track. Cibulkova was as high as No. 12 in 2008.

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