On April 30, 1991, Halme defeated Masashi Aoyagi in a boxer versus karate match. He remained undefeated in NJPW until September 23, 1991, when he was defeated by Shinya Hashimoto in their third match against each other in front of 18,000 fans at the Yokohama Arena. While Halme's matches with Hashimoto were not considered quality matches, he has been credited with helping Hashimoto take his career to another level as the win made Hashimoto look like a "real fighter" as opposed to a professional wrestler. Halme's "boxer versus wrestler" gimmick was ended on October 18, 1991, when he was defeated by Vader.