[kickboxer] Koichi Watanabe (コウイチ・ペタス; born October 26, 1980), better known as Koichi Pettas or simply KOICHI, is a Japanese heavyweight kickboxer competing in K-1, It`s Showtime and GLORY. ==Biography and career == He fights under the ring name Koichi Pettas in honour of his trainer Nicholas Pettas. He faced Mark Miller at ...