Judd Trump started his defence of the Coral World Grand Prix with a comfortable 4-1 victory over Li Hang in Cheltenham.
Hang claimed the first frame with a 129 break, but Trump came back into the match, winning the next two with a century in the third frame.
The world number one produced a total clearance of 138 in the fourth and then a break of 97 to secure his passage into the next round.
Mark Allen fell to a 4-2 defeat to Liang Wenbo, while Matthew Stevens narrowly defeated Shaun Murphy 4-3.
Scott Donaldson eased to a 4-0 victory over UK champion Ding Junhui, having controlled the match from the start, and will next face the experienced Joe Perry, who beat Ali Carter 4-2.
Neil Robertson came through a difficult and hard-fought match against Michael Holt, eventually winning 4-3, while Matthew Selt defeated Thepchaiya Un-Nooh by the same scoreline.
