Former world champions Neil Robertson and Stuart Bingham crashed out of the Evergrande China Championship in the first round.
Robertson, the Hong Kong Open winner last month, lost 5-4 to Li Hang while Bingham, who claimed the world crown in 2015, also fell on the opening day in Guangzhou, beaten 5-3 by teenager Yan Bingtao.
Defending champion John Higgins had no problems as his 5-0 defeat of Lyu Haotian included a break of 129 and reigning world champion Mark Selby came through 5-1 against Luo Honghao.
Shaun Murphy won the last two frames to edge out Ken Doherty 5-4, while China's number one Ding Junhui overcame Niu Zhuang 5-1.
There were also surprise first-round wins for Ian Burns and Mark Joyce, who beat Liang Wenbo 5-3 and Anthony McGill 5-2 respectively.