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In the women’s draw, seventh-seeded Serena Williams and big sister Venus Williams are in opposite halves, setting up the possibility for a fifth sibling final at the All England Club.

The sisters have won nine of the past 11 Wimbledon finals. Serena, who has won four, is 3-1 against five-time champion Venus in the final match.

Serena has played only two matches since winning the title last year after complications with a foot injury led to blood clots on her lungs. She returned in Eastbourne this week, losing a three-set match to Vera Zvonareva.

Zvonareva could meet Venus, who has been seeded 22nd, in the fourth round at Wimbledon. Venus will open against Akgul Amanmuradova of Uzbekistan, and Serena will take on Aravane Rezai of France. Zvonareva is to play Alison Riske of the United States.

As the defending champion, Serena’s first-round match will open play on Centre Court on Tuesday.

Top-seeded Caroline Wozniacki, the No. 1-ranked player looking for her first Grand Slam title, meets Arantxa Parra Santonja of Spain in the first round. If she gets that far, she could meet Serena in the semifinals.

French Open champion Li Na has a potentially tough second-round match. If she gets past Alla Kudryavtseva of Russia in the first round, she could face Sabine Lisicki, who won the Birmingham title on grass last week and was awarded a wild card at Wimbledon after a long injury layoff.

Maria Sharapova, the 2004 Wimbledon champion, will be up against Anna Chakvetadze of Russia in the opening round.