Price played brilliantly throughout but fluffed his lines towards the end allowing Cullen back into proceedings but ‘The Iceman’ is through to the fifth round.
It was a 96 average with a 156 checkout the highlight from the Welshman who will hope to up his performance another gear in the next round.
Chisnall on the other hand who has been one of the form players in darts so far this year is through but he had to battle back to do so.
He came from 8-5 down to defeat Luke Humphries who was really impressive earlier with seven 180’s and a 98 average.
Also through include the likes of Luke Woodhouse who came from behind himself to knock out Gavin Carlin, who had previously knocked out Glen Durrant.
Michael Smith is successfully through in a game of two in-form players against John Henderson while Kim Huybrechts, Cristo Reyes, Keegan Brown and Madars Razma are also through.
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Fourth Round
Friday March 1 – 1900 GMT Start Main Stage Joe Cullen (94.8) 6-10 (96.2) Gerwyn Price
Michael van Gerwen v Mervyn King
Steve Beaton v Gary Anderson
Mensur Suljovic v Peter Wright
Stage Two Dave Chisnall (98.4) 10-8 (96.5) Luke Humphries
Rob Cross v Darren Webster
Raymond van Barneveld v Simon Stevenson
Adrian Lewis v Jamie Lewis
Stage Three Jelle Klaasen (83.8) 4-10 (86.8) Madars Razma
James Wilson v James Wade
Stephen Bunting v Steve Lennon
Geert Nentjes v Max Hopp
Stage Four Peter Hudson (90.5) 3-10 (94.1) Kim Huybrechts
Martin Schindler v Adam Hunt
Jeffrey de Zwaan v Jermaine Wattimena
Benito van de Pas v Gabriel Clemens
Stage Five Luke Woodhouse (96.1) 10-7 (96.5) Gavin Carlin
Joe Murnan v Krzysztof Ratajski
Ricky Evans v Dimitri Van den Bergh
Jan Dekker v Simon Whitlock
Stage Six William O'Connor (89.0) 4-10 (95.1) Keegan Brown
Nathan Aspinall v Christian Kist
Jamie Hughes v Ian White
Daryl Gurney v Reece Robinson
Stage Seven John Henderson (88.3) 5-10 (95.9) Michael Smith
Josh Payne v Kyle Anderson
Jonny Clayton v Arron Monk
Mickey Mansell v Scott Taylor
Stage Eight Cristo Reyes (86.3) 10-2 (86.3) Ryan Joyce
Alan Norris v Ross Smith
Brendan Dolan v Richard North
Ryan Searle v Steve West