Key Biscayne - Yaroslava Shvedova of Kazakhstan defeated 2010 French Open champion Francesca Schiavone of Italy 6-4, 6-2 on Tuesday to advance to a second-round match against top-seeded Serena Williams at the Sony Open.
Williams, who will open defense of her title against the 59th-ranked Shvedova on Thursday, has won all three matches they've played.
Williams did drop a set to Shvedova in their 2012 Wimbledon fourth round meeting.
American Varvara Lepchenko defeated Yanina Wickmayer of Belgium, but fellow American Bethanie Mattek-Sands fell to Elina Svitolina of Ukraine 6-3, 3-6, 6-3.
Monica Puig of Puerto Rico, who lives in Miami, defeated Magdalena Rybarikova of Slovakia 6-1, 7-6 (7).Results on Tuesday from the ATP and WTA Sony Open tennis (x denotes seeding):
Elina Svitolina (UKR) bt Bethanie Mattek-Sands (USA) 6-3, 3-6, 6-3
Yaroslava Shvedova (KAZ) bt Francesca Schiavone (ITA) 6-4, 6-2
Tsvetana Pironkova (BUL) bt Galina Voskoboeva (KAZ) 6-2, 7-5
Kurumi Nara (JPN) bt Annika Beck (GER) 7-6 (7/2), 6-4
Casey Dellacqua (AUS) bt Stefanie Voegele (SUI) 6-3, 6-2
Caroline Garcia (FRA) bt Aleksandra Wozniak (CAN) 6-3, 7-5
Romina Oprandi (SUI) bt Bojana Jovanovski (SRB) 6-2, 6-4
Monica Puig (PUR) bt Magdalena Rybarikova (SVK) 6-1, 7-6 (9/7)
Varvara Lepchenko (USA) Yanina Wickmayer (BEL) 7-5, 6-1
Alisa Kleybanova (RUS) bt Iveta Melzer (CZE) 7-6 (7/3), 6-1
Chanelle Scheepers (RSA) bt Silvia Soler-Espinosa (ESP) 6-3, 6-0
Anna Schmiedlova (SVK) bt Indy de Vroome (NED) 7-5, 5-7, 6-2