In 1990, he equaled his own 100m breaststroke world record of 1:01.49 twice: first, to win gold at the Commonwealth Games in Auckland; and second, in the summer's British Championships at a time when the World Championships had initially been scheduled. However, due to the host city Perth (AUS) being in the Southern Hemisphere, the World Championships were postponed until January 1991 to coincide with summer. Here, Moorhouse swam another fantastic time of 1:01.58 but had to settle for silver behind a new world record and breakthrough performance from Hungary's Norbert Rózsa. (It is worth noting that the FINA World Championships were moved from a four-year cycle to a two-year cycle a decade later. Had that been the case in the late 1980s, then Moorhouse may well have won two world titles given that he was ranked first in the world for the five-year period from 1986 to 1990.)