Two-time champion Gary Anderson survived a huge scare on his 48th birthday to edge into the fourth round of the PDC World Darts Championship.
The Scot, seeded fourth, was taken the distance by 29th-seeded Dutchman Jermaine Wattimena, winning 4-3 at Alexandra Palace in London.
Top seed Michael van Gerwen had no such trouble, sweeping aside Max Hopp 4-1.
Van Gerwen, Anderson and defending champion Rob Cross are the only players seeded in the top eight remaining.
Fifth seed Daryl Gurney was the latest big name to fall, beaten 4-3 by Jamie Lewis in the third round.
Gurney, from Northern Ireland, never settled against Welshman Lewis, who was a semi-finalist as a qualifier last year but has since struggled.
Third seed Peter Wright, Mensur Suljovic (sixth seed), Gerwyn Price (seventh) and Simon Whitlock (eighth) have also been knocked out.
Earlier, 25th seed Alan Norris was knocked out by Ryan Joyce.
Joyce, who beat Whitlock in the last round, came from 2-0 down to beat Norris 4-3.
There was no such drama for 12th seed Dave Chisnall, though, as he won 4-0 against Kim Huybrechts.
In a match of two unseeded players, Ryan Searle beat William O'Connor 4-1.