Ross Bulman caused a shock on day two of the Northern Ireland Open in Belfast as he beat world number 89 Zhang Jiankang 4-1 at the Waterfront Hall.
It was a first win in a professional ranking event for 18-year-old amateur from Youghal, who hit a high break of 92.
Home player Mark Allen also advanced with a 4-1 win over Sam Craigie, which included runs of 74 and 77.
Dubliner Fergal O'Brien registered three breaks over 50 as he saw off Fan Zhengyi 4-2.
They join Ken Doherty and Jordan Browne in the last 64, with both advancing on Monday.
However, Paddy Wallace couldn't roll back the clock. The Dungannon man was beaten 4-2 by Chen Zifan.
World number one Judd Trump was given a scare before getting his title defence up and running with a 4-3 win over James Cahill in Belfast.
Top seed Trump had made centuries in each frame as he cruised into a 3-0 lead, only for Cahill, the world 113, to rally and force a decider.
However, Trump - beaten by Neil Robertson in Sunday's Champion of Champions final in Coventry - kept his composure with a break of 75 to book safe passage into the second round.
Ronnie O'Sullivan reeled off three successive frames to come from behind and beat Oliver Lines 4-2, while Kyren Wilson swept past Scotland's Alan McManus 4-0.
Stuart Bingham, the 2015 world champion, hit a sixth career 147 in the opening frame of his 4-3 win over Lu Ning.