San Diego Open: Navarro battles through to quarter-finals

American Emma Navarro, the No 3 seed, reached the last 8 of the San Diego Open by winning against Katerina Siniakova 6-3, 3-6, 6-1 at the Barnes Tennis Center on Thursday night.

Navarro, ranked No 26, will face Australian qualifier Daria Saville next.

Siniakova, ranked No 43, beat Japanese qualifier Mai Hontama (6-3, 6-1) in the previous round of the San Diego tournament.

San Diego WTA 500, other second-round matches (Barnes Tennis Center, hard, USD 922,573):

• Donna Vekic (7) beat Marina Stakusic (Q): 6-4, 3-6, 6-3
• Anna Blinkova beat Dayana Yastremska (5): 7-6 (6), 6-2
• Jessica Pegula (1) beat Jule Niemeier (Q): 6-0, 6-4
• Katie Boulter beat Beatriz Haddad Maia (2): 3-6, 6-3, 6-4
• Daria Saville beat Tatjana Maria: 5-7, 7-6 (2), 6-2
• Marta Kostyuk (6) beat Taylah Preston (WC): 6-4, 6-3
• Anastasia Pavlyuchenkova vs. Xinyu Wang