Charleston Open: Third seed Zheng beats Sakkari to reach last 16

China’s Qinwen Zheng, the No 3 seed, reached the last 16 of the Charleston Open by winning against Greece’s Maria Sakkari 6-4, 6-1 at the Family Circle Tennis Center on Wednesday.

Zheng, ranked No 8, will play Belgian Elise Mertens, the No 13 seed, next.

Sakkari, ranked No 64, defeated Canadian wildcard Marina Stakusic (6-3, 6-2) in the previous round of the tournament.

Charleston WTA 500, other second-round matches (Family Circle Tennis Center, clay, USD 1,064,510):

• Ashlyn Krueger (15) beat Katie Volynets: 6-3, 7-6 (4)
• Ajla Tomljanovic beat Peyton Stearns (16): 6-1, 6-4
• Jessica Pegula (1) beat Iryna Shymanovich (Q): 6-0, 6-3
• Sofia Kenin beat Belinda Bencic (17): 6-0, 6-3
• Yulia Putintseva (10) beat Shuai Zhang (Q): 7-6 (5), 6-1
• Ekaterina Alexandrova (9) beat Ann Li: 6-3, 6-0
• Emma Navarro (4) beat Hailey Baptiste: 6-4, 6-3
• Jelena Ostapenko (11) beat Louisa Chirico (Q): 7-5, 6-2
• Anna Kalinskaya (14) beat Catherine McNally (Q): 6-1, 6-4
• Daria Kasatkina (5) beat Lauren Davis (WC): 6-1, 6-1
• Diana Shnaider (6) beat Polina Kudermetova: 6-3, 6-2
• Amanda Anisimova (8) beat Veronika Kudermetova: 6-2, 6-2
• Danielle Collins (7) beat Robin Montgomery: 6-3, 6-1
• Madison Keys (2) beat Caroline Dolehide: 6-3, 7-6 (4)