Williams is recovering from a foot injury that required surgery following her singles championship win at Wimbledon. She also won the Australian Open this year.
That leaves the focus of the women's draw in the U.S. Open, which begins Monday and has the women's singles final scheduled for Sept. 11, on last year's finalists -- world No. 2 Caroline Wozniacki and third-ranked Kim Clijsters. Clijsters defeated Wozniacki in last year's Open final.
Williams, with 7,895 ratings points, is solidly in the No. 1, a position she's held for the last 45 weeks and 119 weeks in her career. Wozniacki has 6,410 points while Clijsters is third with 5,325.
Venus Williams (5,176 points) and Jelena Jankovic (5,145) are close behind in fourth and fifth, respectively.
Samantha Stosur (4,550 points) and Francesca Schiavone (4,450) are in sixth and seventh. They played in this year's French Open final with Schiavone winning. But with No. 8-ranked Vera Zvonareva (4,430), ninth-ranked Li Na (4,015) and No. 10 Agnieszka Radwanska (3,995) close behind the women's' Top 10 could see a shake-up in two weeks.
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