Murphey will have the chance to go back-to-back in the Mikeloren Patisserie Tamworth Cup after booking a spot in the final.
The Allan Syphers-trained dog ran the fastest time (26.29) of the heats in winning by a length and a half on Saturday.
Mark Munn's Super Start, who came second to Murphey, ran the second fastest time (26.40) while the Graham Pickering-trained Western Hero was third fastest (26.44).
Western Hero won the second heat while Impress Lleyton won the third heat for Munn in 26.88.
Tamworth Greyhound Racing Club president Robert Munn said Murphey had run a "pretty good time" and looked like the one to beat next weekend.
"He probably would be. He ran second in Gunnedah [in the Chief Havoc Cup Final] last Sunday so he's in good form," he said.
Munn said Saturday was an excellent meeting and was now looking forward to the Tamworth Cup final.
He expected the final to be bigger and, as well as big prizemoney up for grabs, Munn said there would be plenty to do for the kids attending.
"Next week will be the family fun day. We'll have a jumping castle and all that sort of stuff," Munn said.