World number one Michael van Gerwen was knocked out of the PDC World Championship last 16 by five-time world champion and Dutch compatriot Raymond van Barneveld.
Van Barneveld, 48, has failed to win the title since 2007 but stunned the 2014 champion to win a thriller 4-3.
The 16th seed plays eighth seed Michael Smith in the quarter-finals at Alexandra Palace, London.
Van Gerwen's average of 105.78 is the highest ever for a loser in the event.
Van Barneveld told Sky Sports: "In the second set, I started to believe in myself, the emotions came.
"The World Championship means everything to me. The whole year I play fantastic, but this is something extra.
"Michael is a true champion and we are good friends. I have been the man here five times and I believe I can be again."
Van Gerwen added: "It is always sad when you lose. Raymond played well and I missed too many shots at the important moments.
"It hurts a lot but what can you do? I can only blame myself."