Andy Hug
Aerts kicked off 1998 with a majority decision victory over Ernesto Hoost, their third fight, at "K-1 Kings '98" on April 9. He then travelled to Zurich, Switzerland to fight Andy Hug for his WKA World Super Heavyweight Muay Thai Championship at "K-1 Fight Night '98" on June 6, 1998. Hug defeated Aerts via unanimous decision after five rounds to retain his title.