Raymond van Barneveld began the defence of his PDC World Championships title in unconvincing fashion despite beating rank outsider Anthony Forde 3-0.
Van Barneveld was made to work for victory by Barbadian Forde
The Barbadian, 45, had chances to win the second set before Van Barneveld edged it and also won two further legs.
Two-time former world champion Dennis "The Menace" Priestley is out after a 3-1 defeat to Steve Maish.
Ex-BDO champion Jelle Klaasen went out at the first stage in an epic to fellow Dutchman Vincent van der Voort 3-2.
The game went to sudden-death in the final set after Klaasen missed 10 chances to win and it was Van der Voort who held his nerve to win a pulsating contest.
Number six seed Andy Hamilton had earlier overcome the scare of a foot injury to reach the second round by beating Leroy Kwaidjk.
Hamilton held his nerve to beat the Dutch youngster 3-1, despite slipping down a flight of stairs on Wednesday.
"I'll go back home and have an X-ray on it, but it didn't affect my performance too much," said Hamilton.
Number 16 seed Andy Jenkins narrowly avoided an upset, coming from 2-1 down to beat Miloslav Navratil 3-2.
Czech qualifier Navratil made five 180s before being out-gunned by Jenkins' late surge of six straight legs.
Jenkins said: "I started to panic when he went 2-1 up. I thought I was going out but I kept fighting and eventually he broke."
Elsewhere in the first round, Tony Eccles thrashed number 23 seed Wayne Jones 3-0, while 27th seed Alex Roy came from behind to beat Warren Parry 3-2.