But it was Cullen who made it through to the Quarter-Finals at the World Grand Prix and he admitted it was difficult to face a close friend.
But that he is confident and is getting more so as the tournament continues in Coventry with a tie against Dave Chisnall, his next assignment.
"It was always going to be nervy going into the final set and to go to a sudden-death leg, so it's great to get the win," said Cullen. "I felt good going up there and maybe the only downside was that I was playing a good friend and that's always tough.
"In the first two sets I put him under a lot of pressure but he played fantastic darts to work his way back into the game and in the last set it was always going to be close.
"I don't think my level dipped that much but Jonny was relentless with his starting doubles after the first couple of sets.
"The pleasing thing at the end was to take out 254 in five darts, in a sudden-death leg - that's what dreams are made of.
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"This means a lot to me, I feel like I'm getting better and more confident and I felt relaxed going into this.
"I think everyone in the bottom half of the draw sees this as an opportunity and I've got Dave Chisnall tomorrow now. It should be a good game and I'll look forward to it."
Samuel Gill is the Chief Content Officer (CCO) of DartsNews.com, a role he has held since 2020. He is responsible for editorial governance across the platform, including setting content standards, overseeing accuracy and consistency, and guiding long-term editorial strategy across professional darts coverage. Since joining, he has contributed more than 10,000 articles and editorial pieces, playing a central role in the development and daily operation of the site.
Based in Leicester, Samuel has extensive experience in darts media and has been closely involved in coverage of the professional darts circuit for several years. Within the UK darts community, he is a recognised figure known for his consistent editorial output and ongoing reporting on major tournaments and developments across the PDC calendar.
In his current role, Samuel works closely with editors and writers to ensure content meets clear journalistic standards, with a focus on source verification, editorial consistency, and timely updates when new, confirmed information becomes available.
CULLEN EDGES IT!
That win means so much to Joe Cullen as he comes out on top in a nail-biting encounter with his good friend Jonny Clayton, hitting a crucial 180 to set up 74 in the deciding leg!