 Mellor was to make over 220 appearances for Fulham in all competitions over six seasons from 1972 to 1977, including perhaps most memorably an appearance in the 1975 FA Cup Final, during which he was unfortunate enough to be deemed at fault for West Ham's two goals, both scored by Alan Taylor.Mellor moved to Hereford (the Bulls) in September 1977 for the 1977–78 season, but in July of the following year moved to his final league club Portsmouth (Pompey), playing for them until 1982.Mellor quickly became a hugely popular cult figure at Fratton Park, keeping the emerging young Alan Knight out of the team long after he was ready, as Knight made only eight appearances over the course of three years, until the 1981–82 season.