Tochinoshin remained at the top of the heap with an unbeaten record on Wednesday, the 11th day of the Summer Grand Sumo Tournament.
Tochinoshin remained one win ahead of Hakuho and fellow yokozuna Kakuryu, who survived a scare against komusubi Mitakeumi (7-4) at Tokyo's Ryogoku Kokugikan.
Tochinoshin, who is gunning for a second makuuchi division championship and an ozeki promotion, overturned an initial challenge from No. 5 maegashira Kotoshogiku (6-5) to continue the best start of his career.