バズ・ソイヤー
In 1989, Rheingans began touring Japan with New Japan Pro-Wrestling (NJPW), allying himself with his former trainee Leon White, now known as Big Van Vader, and Buzz Sawyer in battling Antonio Inoki, Tatsumi Fujinami, Riki Choshu and Kengo Kimura, but later, he would aid New Japan in their battle against USSR amateur wrestlers such as Salman Hashimikov, Victor Zangiev, Vladimir Berkovich, Timur Zalasov and Wahka Evloev for the remainder of the year. On 1990, he started to help training young wrestlers on the NJPW Dojo, most notably Koji Kitao and Osamu Nishimura. On that time his most notable match was against another decorated amateur wrestler in Victor Zangiev from the Soviet Union on February 10 at the Tokyo Dome, in a winning effort. Later on, he would only engage against young lions such as Michiyoshi Ohara, Hiroyoshi Yamamoto, Manabu Nakanishi, Yuji Nagata and many others. His last match on New Japan saw Rheingans defeat El Samurai on December 11, 1993.