The five-time world champion claimed the final two sets to run out a 4-3 winner over last year's finalist, and the Dutchman has acknowledged that he is full of confidence ahead of his last-eight clash with either Phil Taylor or Kim Huybrechts.
The 49-year-old is quoted by PDC.TV as saying: "I had to keep digging. I kept fighting and I'm proud of myself. It's all about belief and I'm so happy.
"I can't wait for the next match against Phil or Kim. I can't wait for the crowd, for myself and for everyone."