Zhang scores big win over Muguruza in Qatar

Highlights – Angelique Kerber vs Anastasia Potapova

China's Zhang Shuai secured one of the biggest wins of her career at the Qatar Total Open on Wednesday, beating Spaniard Garbine Muguruza.

It was a marathon day for many of the women – Muguruza included – as they were forced to complete their rain-delayed first round matches held over from Tuesday before returning to the court later in the day for their second-round encounters.

After overcoming Turkey's Cagla Buyukakcay 6-3, 6-2 in the morning, fifth seed Muguruza fell 7-6 (7-3), 3-6, 7-5 to her unseeded Chinese opponent in the afternoon.

"I woke up thinking that I was going to have a very tough day," Muguruza said after. "This morning I warm up at 9:00 in the morning. I played pretty good the first match. The second one, Zhang played very well. The conditions were difficult. There was a lot of wind. She was finding her shots. At the end I think was two points difference and they went to her."

Also advancing to the quarter-finals on the day was Dominika Cibulkova, after edging Anastasia Pavlyuchenkova 7-5, 2-6, 6-2, and Monica Puig, whose opponent Yulia Putintseva retired hurt.

In first-round action completed on the day, Denmark's Caroline Wozniacki defeated Kiki Bertens 6-2, 6-3 to set up a second-round clash with Agnieszka Radwanska.

Wozniacki and Radwanska actually took to court for their second-round match before being quickly forced off when it started to rain again.

Elsewhere, Daria Kasatkina of Russia will face Angelique Kerber in round two, after beating Irina-Camelia Begu 3-6, 6-1, 7-5.