Dubliner Fergal O'Brien hit five century breaks en route to victory at the Betway UK Championship.
O'Brien ousted the 2013 World Championship finalist Barry Hawkins 6-5 in the best-of-11 encounter in York.
Welshman Mark Williams progressed courtesy of a 6-2 success over Andrew Higginson, which was the same margin of victory Ali Carter recorded over Robbie Williams.
Stephen Maguire, Dominic Dale, Liam Highfield, Michael Georgiou and Luca Brecel were all victorious in the afternoon session while their were wins for Matthew Stevens, Zhou Yuelong, Jamie Jones, Mitchell Mann and Peter Lines later in the day.
World number two Stuart Bingham became the latest high-profile cueman to make an early exit from the Betway UK Championship following a 6-4 defeat to China's Yu Delu.
Bingham held a 4-3 lead but missed a series of simple shots throughout and then dropped the last three frames as the former world champion followed Neil Robertson, last year's winner of this tournament, in being eliminated in the early rounds in York.
Mark Selby, the only man ranked over Bingham, avoided suffering second-round embarrassment himself, though it hardly more serene as he could only record a narrow 6-4 victory over Daniel Wells.
Selby admitted that he was not in form during a tense match that saw him slip 3-1 behind to world number 68 Wells before he reeled off four of the last five frames to come through the test.
"In patches I played okay, in other patches I was terrible, but I'm just happy to get the win," he said on worldsnooker.com.
"It was a battle. My focus dipped in and out. It is still the early stages of the tournament, I don't want to peak too soon."
John Higgins was another leading light who had to battle to keep himself in the competition as he came from 3-2 down to see off Noppon Saengkham, ranked 69 places beneath him, 6-4.
"I dodged a bullet there, I'm just delighted to get through," added the former two-time winner of this tournament. "I really did think I'd be heading up the road when I went 4-3 down."
