Tatsuyoshi recorded two title defenses before losing to Veeraphol Sahaprom on December 29, 1998. He challenged Sahaprom in August 1999, but lost again in the seventh round, and announced his retirement after the fight. He changed his mind shortly afterwards and resumed his training, making a comeback fight on December 15, 2002, winning by TKO after more than three years of inactivity. He won again in September 2003, but fell into inactivity again after injuring his left knee. There are no plans for a next fight, but he still trains with his son, Jukiya, who wishes to follow his father into professional boxing.