Defending champion Judd Trump came through a tough first-round match against Jimmy White in the China Open.
Trump raced into a 4-1 lead before White hit back with a century and took the next two frames, but Trump held his nerve to win 5-3.
China's Ding Junhui recovered from 4-0 down at the mid-session interval to edge past England's Ben Woollaston 5-4.
Meanwhile last year's runner-up Mark Selby eased through to round two with a 5-0 whitewash over China's Li Hang.
Third seed Selby, who lost to Judd Trump in last year's final, made a clearance of 139 as he raced into a 4-0 lead before booking his place in the second round.
Former champion Stephen Maguire also claimed a routine victory as he saw off Barry Hawkins 5-1.
Graeme Dott earned a 5-2 victory over Mark King, while the in-form Stephen Lee beat Tom Ford 5-1.
The final two qualifiers were also played and Rory McLeod set up a first-round meeting with world champion John Higgins after beating Zhou Yuelong 5-0, while Jin Long defeated Fergal O'Brien 5-4.