Selby crashes out in Newport
World No 1 Mark Selby is out of the Welsh Open, while Judd Trump accused Dominic Dale of slow play after a narrow win.
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Selby, the Masters and UK champion, was a 4-0 loser against Joe Perry, with the Cambridge cueist finding his form on the big stage again.
"It has been a while since I played like that at a venue," he said.
"I played Mark in Germany a couple of weeks ago. He beat me 5-2 and took every half chance that came his way.
"I knew I would have to play well today, although I was surprised that he didn't take his chances this time."
Meanwhile, Trump narrowly scraped past Dale after diging deep to win the last three frames and avoid another upset.
Trump has been desperately searching for form over recent months, with opening-round defeats at the UK Championship, Masters and German Open undermining his reputation as the sport's new great hope.
An early exit appeared on the cards again when he trailed Dale 3-1 in a best of seven, but he managed to find a way through and then told his opponent his tactics had cost him.
"Players are changing their game to play slower against me," he said on worldsnooker.com.
"Dominic was too slow for himself and it caught him out towards the end. He usually goes for his shots but he took no chances today.
"Some players have a game plan to slow me down and hope I lash out. A couple of years ago I would have panicked in that match, but I showed patience today."
Trump will next face Andrew Higginson, a 4-2 winner over Michael Walsey. Mark Williams lost 4-1 to Robert Milkins, although may have had other things on his mind as his wife was in labour, but there were no distractions for Stuart Bingham as he beat Craig Steadman 4-0.
Ding Junhui also enjoyed a whitewash, his against Mark King, while Tom Ford sprung a minor surprise by seeing off Ricky Walden 4-1.
Graeme Dott beat Fergal O'Brien 4-2 in the day's final game.