佐竹雅昭
Longinidis continued to defend his titles, also adding the ISKA World Heavyweight Championship to his collection in 1993 and the WAKO PRO World Super Heavyweight Championship 1994. He began competing for the K-1 kickboxing promotion in March 1993, becoming one of the first major fighters to be signed by the company. After defeating reigning Karate World Cup champion Toshiyuki Atokawa in K-1's first event, Longinidis fought rising star Masaaki Satake in a title-versus-title affair, with Satake wagering his UKF World Super Heavyweight Championship and Longinidis his WKA World Super Heavyweight Championship. Longinidis lost by unanimous decision but retained his title after asserting that the match had not taken place under WKA rules.