Jamie Lewis set up a quarter-final with Michael Van Gerwen after beating eight seed Michael Smith at the 2015 World Grand Prix in Dublin.
Jamie won the deciding leg with a confident 108 finish, and booked his place in his first ever televised quarter final.
“I’m over the moon,” said Cardigan-based Lewis. “At 2-0 down I thought it was game over so I’m really chuffed to come back and win.
“I felt a bit edgy and at 2-0 down I had nothing to lose. I’ve learned over the years that at 2-0 down the game’s not over until they hitting the winning double, so that was in my head tonight and I managed to get the job done in the end.
“I’m really pleased. In the last year or so, I’ve felt as if I belong playing in the TV majors and I’m trying to make myself an established player, and it’s going well so far.”