World No. 1 women's tennis player Amelie Mauresmo of France has been knocked out of the semifinals of the NASDAQ-100 Open tennis tournament, in Key Biscayne outside Miami, Florida.

Mauresmo lost in straight sets to former U.S. Open champion Svetlana Kuznetsova of Russia, 6-1, 6-4.

Kuznetsova takes on the winner of the other semifinal between last year's runner-up, Maria Sharapova of Russia and Tatiana Golovin of France. Kuznetsova lost her only career meeting with Golovin in the 2004 Fed Cup while she has split four matches against Sharapova.

Meanwhile another former U.S. Open winner, American Andy Roddick, lost his men's quarterfinal match to Spain's David Ferrer (6-3, 4-6, 6-4). Roddick has not reached a tournament final so far this year. Ferrer next plays world No. 1 Roger Federer of Switzerland,  who scored a straight-set win over American James Blake, 7-6, 6-4. 

The tournament is the second largest and second-richest in the United States. Both the men's and women's winners take home $533,350.

Some information for this report was provided by AP.