Two-time world champion Adrian Lewis was on the end of a major shock in the opening round of the William Hill World Championship after being beaten by Germany's Kevin Munch.
Munch had to come through a preliminary contest on Tuesday to earn his match against Lewis and responded by defeating the Englishman 3-1 at Alexandra Palace.
Munch hit the bullseye to complete a 124 checkout and take a 2-1 lead, then settled matters on double eight to stun a man who reigned supreme at the event in 2011 and 2012.
Defeat in the first round is the latest setback in a miserable couple of years for the 32-year-old, who is now destined to slip out of the world's top 16 for the first time in more than a decade.
'I can't believe it,' said Munch, who had earlier beaten Russian Aleksandr Oreshkin.
'It feels so amazing. I will realise what I've done tomorrow. I was so confident in that moment and not scared of him.
'I will go to the 27th and the second round now. I didn't realise the fans were so loud but I do now! I will relax and practice for the second round now.
It is the latest in a line of shocks in London following the exit of eight-time major winner James Wade on Sunday.
Keegan Brown stunned world No 11 Wade in the first round with a 3-2 victory.
Elsewhere on Tuesday, Raymond van Barneveld had a smoother ride into the second round, easing past Richard North 3-0, with Scotland's John Henderson also sailing past Marko Kantele without dropping a leg.