Zhang scores big win over Muguruza in Qatar

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.