Martin Adams whitewashed Tony O'Shea in the first round of the BDO World Championships, while top seed Stephen Bunting is also through to the last 16.
Three-time world champion Adams needed just 23 minutes to win all nine legs against O'Shea, three times a Lakeside runner-up.
"I can't believe it," said 57-year-old Adams, who is based near Peterborough. "You don't do that to Tony."
Bunting beat American Jim Widmayer 3-1 in round one.
The 28-year-old from St Helens is the number one seed for the second consecutive year, having won eight BDO titles in 2013, but has never been beyond the last eight in six previous World Championship appearances.
Bunting won the first six legs without reply, and although Widmayer hit back to the take the third set, the world number one progressed safely through to the second round.
"I have played really well here over the past few years and it's just a couple of doubles that have let me down," Bunting told BBC Sport.
"I'm practising a lot more now than I have done previously, so hopefully that will pay dividends for me."
Bunting's second-round opponent will be Hartlepool's Dave Prins, who beat Welshman Jim Williams 3-0.
Second seed James Wilson fought back from a set down to defeat 2012 champion Christian Kist 3-1 in a high-quality contest, while 10th seed Glen Durrant from Middlesbrough was a straight-sets winner over Kiwi qualifier Mike Day.
Scott Mitchell, the 15th seed from Dorset, came through in a deciding set against Paul Hogan.
Basingstoke's Hogan had his moments, hitting a 161 checkout - the highest outshot of the tournament so far - but Mitchell held his nerve to land double 18 for the match.
Earlier, the Frimley Green crowd has been shocked by Adams' demolition of O'Shea, who admitted afterwards that he had been "embarrassed" by his performance.
"It was probably my worst one ever, to be honest," the 52-year-old from Stockport told BBC Sport.
"I don't want to take anything away from Martin. He played really steady. I'm just gutted that I didn't give him a game, that's the frustrating thing.
"It would be brilliant if I had an excuse or a reason but I can't put my finger on anything."
In the ladies' draw, number one seed Deta Hedman was very impressive in her 2-0 victory over Lorraine Farlam, posting an average of more than 83.