Ding Ning of China reacts during the women's singles quarterfinal match against Ito Mima of Japan at ITTF World Tour Platinum China Open in Shenzhen, south China's Guangdong Province on June 1, 2019. Ding Ning lost 1-4. (Xinhua/Wang Dongzhen)

SHENZHEN, South China, June 1 (Xinhua) -- No. 7 seed Mima Ito stunned top seed Ding Ning 4-1 in quarterfinals of ITTF China Open here on Saturday, advancing to her second semifinals in China Open.

Ding started the game well by winning the first set 11-7, but the world No.1 was floppy on key points-losing consecutive four sets 12-10, 18-16, 13-11, and 11-9, all by two points.

"I felt no good on my services, my opponent gave me a lot of pressure when returning the ball." Ding said.

"I am very happy to win today, I made full preparation before the match." Ito said.

The 18-year old will face another Chinese Wang Manyu in the semifinals on Sunday. Wang beat newly crowned world champion Liu Shiwen 4-1 to book her spot.

"I hope to have even more matches with Chinese players, in order to make more progress in the future." Ito said.