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.