Former World champion Peter Ebdon survived a scare in the first round of the UK Championship as he had to fight back to beat Ross Muir 6-5 in York.
The Scotsman raced out into a 2-0 lead, aided by a break of 85 in the second frame but, after claiming a scrappy third, the 2002 world champion registered a 73 in the next to level things up.
The two men then exchanged frames until the contest got to 5-5 and Ebdon edged a decider to move into the second round.
Graeme Dott, another former world champion, did not have such trouble as he eased past Alexander Ursenbache 6-2 after opening a 4-0 lead.
The Swiss fought back to get it to 4-2 but Dott closed out victory with a break of 95.
Judd Trump had the easiest afternoon of the lot as he was handed a walkover against China's Rouzi Maimaiti while Robert Milkins was not given much more resistance in a 6-0 win over Scotland's Michael Leslie.
World number five Barry Hawkins made serene progress as he cruised to a 6-1 win over Ashley Carty while Norwegian Kurt Maflin beat Chris Norbury by the same score.
Nigel Bond's 132 in the fourth frame gave him a 4-0 lead against Stuart Carrington as he went on to win 6-3 and Marcus Campbell was a 6-4 winner in an all-Scottish battle against Scott Donaldson.
Fergal O'Brien begins his tournament against Brazilian Igor Figueiredo at 1930 tonight, before Ken Doherty and Mark Allen play their first-round ties on Thursday.
Ebdon was relieved to progress and said afterwards: "That was really tough, all credit to Ross he played really, really well.
"The way he started the first two frames I thought I was playing Stephen Hendry at his best. It was just incredible, he played really, really well and it was really tough."
Milkins was also delighted to get through and while his opponent gave him little trouble, he admitted he was struggling with his vision.
"I'm struggling a little bit because I've got something in my eye so my long game was a bit blurry today," he said.
"I don't think I'll be going to the doctors, just like any other bloke, I suppose. I'll see what I've got in the medicine cupboard back home and come back up here on Friday and hopefully it will be all sorted."
In the remaining early clash, Anthony Hamilton was docked the first frame for arriving late but still managed to overcome Craig Steadman 6-5.
"I came out of the dressing room, saw some players standing around and I joined them - but my lot were over the other side," he told the Nottingham Post. "I realised after two or three minutes but by then it was too late.
"I got over it straight away - what can you do? Actually, that was the only time I played well, when my head was spinning a bit off that. I thought to myself 'I've got to just forget about it' and played okay. Then I struggled in the second half."
In the evening session, Stuart Bingham was a 6-0 winner over Thanawat Tirapongpaiboon, the highlight of which was a 102 clearance in the second frame.
Joel Walker provided an upset as the world number 105 overcame veteran Alan McManus 6-1 while Michael Holt beat Zak Surety by the same score and Dechawat Poomjaeng was a 6-2 winner over Andrew Norman.
Tom Ford won the last two frames to record a 6-4 victory over Barry Pinches, while Aditya Mehta and Alfie Burden triumphed by the same scoreline over Alex Davies and Chris Wakelin respectively.