Top-seeded Belgian Justine Henin return a ball during match against Elena Vesnina of Russia at the Sony Ericsson Open on March 31, 2008.(Xinhua/Reuters Photo) Photo Gallery>>>

    WASHINGTON, March 31 (Xinhua) -- Defending champion Serena Williams of the United States will meet Belgian Justine Henin in a showcase quarterfinal after overcoming Estonia's Kaia Kanepi 6-3, 6-3 at the Sony Ericsson Open on Monday.

Serena Williams of the United States returns a ball during her match against Estonia's Kaia Kanepi at the Sony Ericsson Open on March 31, 2008. (Xinhua/Reuters Photo) Photo Gallery>>>

    It's also a rematch of last year's final, in which Henin lost after Williams saved two championship points.

    Williams has lost their past three meetings, all last year, at the French Open, Wimbledon and the U.S. Open.

    No. 6 Venus Williams joined her sister in the quarterfinals by beating 17-year-old Caroline Wozniacki 6-3, 6-3.

    Top-seeded Henin defeated Elena Vesnina of Russia 6-2, 6-2 after hitting eight aces and holding every service game against the Russian.

    A superior serve and return helped Venus Williams defeat Wozniacki, a Dane who has won 14 matches this year to climb to a career-best 43rd in the rankings. Williams lost only six points on her first serve and repeatedly slammed Wozniacki's serve for winners.

    Williams is a three-time Key Biscayne champion, but her most recent title in the event came in 2001.