SHENZHEN, China, Jan. 3 (Xinhua) -- World No.1 Simona Halep came from a set down to overcome China's Duan Yingying 3-6, 6-1, 6-2, reaching quarterfinals of the Shenzhen Open here on Wednesday.

Halep broke Duan five times in the second and third sets after failing to have a break point in her opponent's first five service games.

"I think she played really well in the first set. I think she got a little bit tired and also had the problem with her leg. It was not easy for her to move," Halep said.

Halep will face Aryna Sabalenka from Belarus, who beat Montenegrin qualifier Danka Konvinic 6-1, 6-0 to reach the quarterfinals.

No.4 seed Irina-Camelia Begu also came from a set down to defeat Russian Ekaterina Alexandrova, 4-6, 6-1, 6-2. Kristyna Pliskova from Czech Republic edged out Romanian Ana Bogdan, 6-4, 7-6(3).