Mr. X is the primary antagonist of the series. He commands a shadowy golf syndicate dedicated to disrupting the sport and opposing the protagonist. Operating covertly, this organization recruits skilled professional golfers, often employing morally questionable methods, to achieve its objectives. Specialized agents within the syndicate, such as the kung-fu golf master Dragon, are deployed to challenge and defeat Sarumaru Sarutani in tournaments. Mr. X strategically hires these rival golfers specifically to target Sarumaru, recognizing the young golfer as a significant threat to his operations. His tactics extend beyond direct challenges to include psychological manipulation, seeking to weaken Sarumaru's morale and focus. This is exemplified by actions like exploiting the hospitalization of Sarumaru's brother, Nakamaru, after a scorpion sting. No concrete information exists regarding Mr. X's personal background, physical appearance, real name, motivations beyond opposing Sarumaru, or character development across the series, movies, OVAs, or spin-offs. The available details consistently frame him solely as the hidden leader orchestrating conflict through his syndicate.