North End had the lead inside just eight minutes thanks to an excellent run and cross from Chris Sedgwick. The former Rotherham winger found Mellor inside the six yard box who had the simple task of tapping in from close range.
Mellor celebrates scoring his 3rd goal in as many games for North End.
Billy Jones may have felt hard-done by not to have won the man of the match award but was able to cap off his excellent performance with a goal.
Billy Jones netted his first goal of the season and his third in Preston colours thanks to an audacious lob over Joe Lewis in the Peterborough goal.
Despite the positives, the victory over Peterborough was marred by the injury to Barry Nicholson. The former Aberdeen midfielder suffered a broken leg after challenging for the ball.
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