TOKYO, FUKUOKA, Japan (Reuters) — A probe into an assault by a sumo grand champion is threatening to stain the image of Japan’s ancient national sport just as its popularity was recovering from previous scandals and a shrinking fan base. Mongolian “Yokozuna” (grand champion) Harumafuji apologized last week after reports emerged that he had pounded junior wrestler Takanoiwa with his bare fists and a Karaoke remote control while drinking at a restaurant-bar. Police are investigating […]