Humphries who reached the World Championship Quarter-Finals last year spoke on his relief of winning against Petersen.
He added that he had a point to prove due to last years heroics and didn’t want to be known as a one-off.
"That was a really hard game to win, Devon made life very difficult for me up there," said Humphries.
"Devon was outscoring me but my doubles were good, and just like Michael van Gerwen I hit the doubles when I needed them most.
"I've got some good memories here from last year and there was a little bit of pressure on me because I don't want people to think last year was a one-off.
"I didn't score well tonight but I know that's a one-off for me and tomorrow we will see a much better performance from myself."
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