Key Biscayne, FL (Sports Network) - Five-time champion Serena Williams and reigning titlist Agnieszka Radwanska were a pair of easy second-round winners Thursday at the Sony Open tennis event.
The world No. 1 Williams popped seven aces in whipping helpless Italian Flavia Pennetta 6-1, 6-1 in 1 hour, 17 minutes, while the fourth-seeded Radwanska rolled past Taiwan's Su-Wei Hsieh 6-3, 6-2 at Crandon Park.
The Wimbledon runner-up Radwanska beat French Open titlist Maria Sharapova in last year's Miami finale.
In addition to her five titles here, the reigning Wimbledon and U.S. Open titlist Williams is also two-time runner-up in Miami.
Her third-round opponent will be Japan's Ayumi Morita.
Also on Day 3, fifth-seeded Australian Open runner-up Li Na whipped Dutchwoman Kiki Bertens 6-3, 6-1 and seventh-seeded former Wimbledon champ Petra Kvitova overcame Chinese Peng Shuai 5-7, 6-2, 6-2.
Meanwhile, rising American Sloane Stephens, seeded 16th, was bageled in the first set before reaching the third round with a come-from-behind victory against Belarusian Olga Govortsova, 0-6, 6-4, 6-4.
In other action involving seeds, Croat Ajla Tomljanovic took out No. 24 Julia Goerges of Germany 7-6 (7-4), 6-2, No. 30 Kirsten Flipkens of Belgium swatted Swiss Stefanie Voegele 6-4, 6-2 and the aforementioned Morita took out No. 31 Yanina Wickmayer of Belgium 7-6 (7-2), 2-6, 6-3.
The winner of this 13-day, $4.196 million tournament will earn $724,000.