Monterrey, Mexico -- Na Li upset top-seeded Agnieszka Radwanska Monday in the opening round of the women's Monterrey Open tennis.

Na defeated Radwanska 7-6 (7-5), 4-6, 6-0.

Fourth-seeded Zheng Jie defeated Urzsula Radwanska 6-3, 6-3; seventh-seeded Gisela Dulko defeated Nathalie Dechy 6-4, 7-5; eighth-seeded Maria Kirilenko defeated Marina Erakovic 6-4, 6-3; and Lucie Safarova defeated Melissa Torres Sandoval 6-4, 6-1.

Copyright 2009 by United Press International.

Dubai, United Arab Emirates -- Ninth-seeded Agnieszka Radwanska was upset by her sister, Urszula Radwanska, in first-round play Monday at the $2 million Dubai Tennis Championships.

Urszula Radwanska defeated her sister, who is ranked No. 10 in the world, 6-4, 6-3 in the first on-court meeting since Urszula turned pro. Agnieszka Radwanska managed to break her younger sister's serve just once in the match.

While most of the action Monday was in the first round, seventh-seeded Svetlana Kuznetsova was ousted 6-4, 3-6, 6-0 by Elena Vesnina and eighth-seeded Ana Ivanovic defeated Alisa Kleybanova 7-5, 6-4 in second-round matches.

In another first-round upset, Ayumi Morita beat 15th-seeded Anna Chakvetadze 7-5, 6-2. No 10-seeded Alize Cornet stopped Anna-Lena Groenefeld 6-4, 6-1, while 11th-seeded Marion Bartoli edged Ai Sugiyama 6-0, 4-6, 7-6 (8-6), No. 12-seeded Dominika Cibulkova breezed past Sorana Cirstea 6-4, 6-2 and 14th-seeded Anabel Medina Garrigues ousted Andreja Klepac 6-3, 6-1 in first-round matches.