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Li, Radwanska reach fourth round in Miami

Key Biscayne, FL (SportsNetwork.com) - Li Na and Agnieszka Radwanska were winners Sunday in the third round of the Sony Open.

The second-seeded Li earned a 7-6 (7-3), 6-3 victory over American Madison Keys in the opening match of the day. It was also her first match of the tournament, as the Australian Open champion received a walkover win in the second round when Alisa Kleybanova was unable to take the court on Friday because of a viral illness.

Li, a semifinalist last week at Indian Wells, will next face 15th-seeded Spaniard Carla Suarez Navarro, who took down 24th-seeded Estonian Kaia Kanepi 6-2, 6-1.

Radwanska, the third seed from Poland, defeated 32nd-seeded Russian Elena Vesnina 7-5, 6-3. Radwanska was last week's runner-up at Indian Wells, falling to Italy's Flavia Pennetta in the final.

Pennetta, who also took out Li last week, lost to Ana Ivanovic on Saturday.

In a pair of matchups between seeded players, No. 10 Dominika Cibulkova downed 22nd-seeded Alize Cornet, while No. 11 Caroline Wozniacki clipped 17th-seeded Sloane Stephens.

The Slovak Cibulkova slipped past Cornet of France 7-6 (8-6), 6-4, while Denmark's Wozniacki sailed to a 6-1, 6-0 victory over the American Stephens.

Despite Stephens' setback, two other Americans advanced in 29th-seeded Venus Williams and Varvara Lepchenko.

Williams outlasted Australian wild card Casey Dellacqua 6-4, 5-7, 6-4, while Lepchenko notched a 6-4, 6-7 (4-7), 7-6 (7-2) triumph over Croatia's Ajla Tomljanovic.

Additionally, Ukrainian Elina Svitolina rallied past Czech Barbora Zahlavova Strycova 4-6, 6-4, 6-1.

The 2014 Miami champ will collect $787,000.