Dave Chisnall edged out Jamie Caven 13-11 in a BetVictor World Matchplay thriller to reach the second round in Blackpoool on Monday night.
The pair slugged it out across 24 legs with the Morecambe-based ace missing several key doubles before eventually getting over the line.
Although Caven held a slender 2-1 lead early on Chisnall hit back to take a 6-4 advantage with the aid of a 13-darter and a 14-dart finish.
Caven took the next two to level at six-all, with the next six legs all going with the throw to send the game into a tie-break at 9-9, leaving a player needing to win by two clear legs.
The pair traded tops finishes and then shared the next two legs to remain locked at 11-all as Chisnall twice missed a single match dart, with double nine then seeing the number seven seed move 12-11 up and to the brink of victory.
With Caven throwing to force a sudden-death 25th leg, Chisnall kicked off with 140, 180 - his 13th of the game - and 135 to leave 46, and eventually sealed victory at the eighth attempt.
The resort thrower said: “It was a funny game but a good game for me because I won.
“Hats off to Jamie because he played well and kept plodding on and hitting his doubles and pulling it back, but thankfully I broke his throw in the last leg.
“I had a feeling that the game was going to go all the way because he’s a great player. Sometimes I was in control but I was probably under pressure more than Jamie because I was almost always in the lead.
“My scoring’s never a problem but sometimes it’s my doubles which are a bit dodgy, but luckily I won tonight and that’s all that matters.”
Chisnall now faces World Youth Champion Keegan Brown tomorrow, Wednesday, after he enhanced his growing reputation by upsetting Robert Thornton 10-7.