Jose de Sousa defied five ton plus checkouts to get past Luke Humphries in a 10-8 victory after an entertaining clash on Saturday at the European Championship.
De Sousa produced a 123 checkout after Humphries wired a 170 which he admitted was a turning point.
"It's amazing for me to make the quarter-finals here," said De Sousa. "Playing against Luke is always difficult - he has such talent.
"The 123 was a special moment from the Special One! I think it was crucial. I'm very happy that I'm through and I hope in the next round I can play my best game."