Meanwhile, on August 2, 1978, Urquidez faced the then fifth-ranked welterweight Thai boxer, Prayout Sittiboonlert, in Tokyo as part of the Shin-Kakutojutsu Organization's first independent event. The rules for the bout included six two-minute rounds, one-minute intervals, and no elbow contact as per agreement with Urquidez. Urquidez lost a heart-stopping decision to the Thai, who controlled the fight with relentless knee attacks and through the masterful use of Thai clinches. Afterward, Urquidez claimed he had been maneuvered into a competitive bout under unaccustomed "new rules" through deliberate misrepresentations. A rematch was set on October 30, 1978 at the Budokan (Martial Arts Hall) as part of the five world championships card for the Shin-Kakutojutsu Organization. However, for unknown reasons, Urquidez canceled the fight on the day of the event. According to one report, Urquidez did travel to Japan, but was unable to recover sufficiently from a high fever which he contracted from an allergic reaction to pain medication being used to treat a lingering left knuckle injury. This sanctioning organization was among several discontinued in 1981 for alleged ties to organized crime. Both the WKA and the STAR world ratings regarded this bout as muay Thai, a separate sport, and did not include it as part of Urquidez's rankings and record count for kickboxing.