NEW YORK (AP) – Maria Sharapova regained her No. 1 ranking Monday after reaching the U.S. Open semifinals, and Mary Pierce re-entered the top 10 for the first time in more than four years.

Sharapova reached No. 1 for the first time on Aug. 22, bumping Lindsay Davenport from the top spot for the first time since October. But Davenport, who missed much of the summer with a back injury, went back to No. 1 the following week after winning at New Haven, Conn.

Among the men, Roger Federer, coming off his second straight U.S. Open title, remained No. 1. He is followed by Rafael Nadal, Marat Safin, Andy Roddick and Lleyton Hewitt.

Andre Agassi, who lost to Federer in the final, is No. 6, advancing one spot. Completing the men’s top 10 are Nikolay Davydenko, Guillermo Coria, David Nalbandian and Mariano Puerta.

Sharapova lost in three sets to eventual champion Kim Clijsters at the Open. Davenport, who was upset by last year’s runner-up, Elena Dementieva, in the quarterfinals, dropped to No. 2.

Pierce jumped six spots to No. 6 in the WTA rankings, her first appearance in the top 10 since April 1, 2001. Clijsters moved up a spot to No. 3, trading places with Mauresmo, on the strength of her win.

Henin-Hardenne moved up two spots to fifth, and Venus Williams jumped from No. 10 to No. 7.

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