World number one Michael van Gerwen has been knocked out of the 2016 PDC World Darts Championship in a classic encounter against countryman Raymond van Barneveld.
Van Gerwen twice came from behind to level but Van Barneveld remained strong to seal the last set three legs to one for a 4-3 win.
The contest will go down as one of the best of all-time, with five-time world champion Van Barneveld (four BDO, one PDC) set to face Michael Smith in the next round.
"The world championship means everything to me," Van Barneveld told Sky Sports. "I've been playing well all year. This is amazing. I am so happy, you cannot describe it."
Gary Anderson booked his place in the quarter-finals with an emphatic 4-0 triumph over Vincent van der Voort.
The 2015 champion was in sensational form as he breezed past his Dutch opponent, dropping just one leg in a straight-sets triumph.
He will face James Wade in the last eight after the eight-time major champion eased past Jamie Caven 4-1, despite admitting to struggling with illness.
Jelle Klaasen checked out on 170 during his 4-2 win over Mervyn King, finally making his way through despite missing five darts to win the decisive fifth leg of the sixth set.
Next up for the Dutchman is 14-time PDC champion Phil Taylor in the last 16.
Michael Smith made light work of Benito van de Pas with a straight-sets win in the day's second encounter.
Smith quickly found his rhythm and took the opening two sets with eight 180s, before booking his place in the quarter-finals for the first time with a 4-0 triumph.
Adrian Lewis suffered defeat to Van Barneveld in the last 16 of last year's competition but he breezed into the quarter-finals with a 4-0 win over Mensur Suljovic.