Pole Iga Swiatek, the top seed, defeated Chinese lucky loser Qinwen Zheng 6-4, 4-6, 6-1 to advance to the quarter-finals of the San Diego Open at the Barnes Tennis Centre on Thursday evening.
Swiatek, ranked No 1, will face the winner of the match between Canadian Bianca Andreescu and American Coco Gauff, the No 6 seed, next.
Zheng, ranked No 28, benefited from the abandonment of Spaniard Garbine Muguruza (5-0) in the previous round.
San Diego WTA 500, other second-round results (Barnes Tennis Centre, hard, USD 757.900, most recent results first):
- Jessica Pegula (4) beat Coco Vandeweghe (WC): 6-3, 6-1
- Danielle Collins beat Martina Trevisan: 6-2, 6-4
- Donna Vekic (Q) beat Karolina Pliskova: 6-3, 6-2
- Louisa Chirico vs. Paula Badosa : Thursday in San Diego
- Sloane Stephens vs. Aryna Sabalenka : Thursday in San Diego
- Madison Keys vs. Daria Kasatkina : Thursday in San Diego
- Bianca Andreescu vs. Coco Gauff : Thursday in San Diego
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