1998 was Michael Klim's year in the sun. In January, the World Aquatics Championships were held in Perth, Western Australia, and in front of a boisterous home crowd, he was the leading swimmer of the meet. He triumphed in the 200 m freestyle and the 100 m butterfly, and added silver in the 100 m freestyle, and bronze in the 50 m freestyle. He was a member of each of Australia's three relay teams, winning gold in the 4×200 m freestyle relay and 4×100 m medley relay, and a silver in the 4×100 m freestyle relay.