Klaasen has struggled since switching to the PDC circuit
Former BDO world champion Jelle Klaasen sent 10th seed Colin Lloyd crashing out of the PDC World Championship in the first round.
The Dutchman, who defected to the rival circuit in 2007, a year after his world title, controlled matters from the off and eased away to a 3-0 victory.
But sixth seed Adrian Lewis beat Russell Stewart 3-1 to go through.
Mervyn King beat China's Shi Yongsheng 3-0 while veteran John MaGowan defeated Chris Mason 3-0.
Klaasen averaged 93 to take a quick-fire opening set against Lloyd and continued his good form into the second set, taking it without conceding a leg.
Lloyd, a former world number one, found himself under increasing pressure thanks to the Dutchman's accuracy and it was no time before he was condemned to a third opening-round defeat in four years.
Klaasen will face either his compatriot Jan van der Rassel or last year's runner-up Kirk Shepherd in the next round
I've been practising hard. I've got a shed at home and have been in there since I qualified
Although Lewis, twice a quarter-finalist, hit eight maximums and three hundred-plus check-outs in his win, he struggled to stay focused at times.
"I'm happy to win but should have shown Russell more respect," he said. "I lost my concentration at times and didn't treat the game right.
"I hit eight 180s but only averaged 86 and that's not good enough."
MaGowan, 67, only booked his place at Alexandra Palace in last month's qualifiers and closed out the deciding set despite missing four doubles.
"It's my best win and I've been practising hard for it," he said. "I've got a shed at home and have been in there since I qualified and it's sharpened me up."