Serena Williams fought off all seven of Flavia Pennetta's break points to win her Sony Open Tennis opener. Garbiñe Muguruza, Magdalena Rybarikova and Ayumi Morita all picked off seeds.
Urszula Radwanska snapped up the last spot in the third round with an upset of Sloane Stephens on Saturday night. Top seed and defending champion Victoria Azarenka was also a winner.
Venus Williams survived a big test against Garbiñe Muguruza in the second round of the WTA Brasil Tennis Cup on Wednesday night, rallying from 3-1 down in the third to beat the Spaniard.
She may have needed eight match points to do it, but Venus Williams beat Mirjana Lucic-Baroni in her first round match at the WTA Brasil Tennis Cup. Olga Puchkova pulled off a big upset.
Yanina Wickmayer battled past Anastasia Pavlyuchenkova as the first round wrapped up at the Open GDF SUEZ. The second round began as well with some Top 10 star power.