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Flushing Meadows, NY (Sports Network) - A pair of top-five seeds -- Agnieszka Radwanska and Li Na -- moved into the round of 16 Friday at the 2013 U.S. Open.

The third-seeded 2012 Wimbledon runner-up Radwanska topped 32nd-seeded Russian Anastasia Pavlyuchenkova 6-4, 7-6 (7-1), while the fifth-seeded former French Open champion and two-time Australian Open runner-up Li took care of 30th- seeded British left-hander Laura Robson 6-2, 7-5 on the hardcourts at the USTA Billie Jean King National Tennis Center.

Last month's Wimbledon semifinalist Radwanska is seeking her first-ever trip into a U.S. Open quarterfinal, while Li reached her lone quarterfinal in New York City four years ago.

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