Mark Selby has withdrawn from the China Open with a neck injury.
The world number one had been due to play Ding Junhui in the last 16 but is returning to England for treatment.
"I struggled through my first-round match and I don't want to do any more damage, especially with the World Championship coming up," he said.
Ronnie O'Sullivan crushed Mark Williams 5-1 in their second-round match, while defending champion Judd Trump beat Stuart Bingham 5-3.
World number two Williams, who has not beaten O'Sullivan for 10 years, missed an opportunity to level the tie at 2-2 and went on to lose 5-1.
O'Sullivan, who now leads their head-to-head meetings 23-7, will meet the Welshman again in the second round of the World Championship if both players win their first-round matches.
Trump, who beat Mark Selby in last year's final, won three frames on the trot to book his place in the quarter-finals.
He will face Stephen Lee, who continued his good run of form with a 5-3 victory against Graeme Dott.