Yahatayama Sadakichi

was a Japanese professional sumo wrestler from Tosa District, Kōchi (now Kōchi, Kōchi Prefecture). He reached the rank of ōzeki in May 1891 and was the first wrestler from Kōchi Prefecture to be promoted at that rank. He remained the only ōzeki from his home prefecture until the promotion of Kunimiyama in May 1905, 14 years later.

History Little is known about Yahatayama before he became a professional sumo wrestler (rikishi). He decided to become a wrestler by joining the Osaka-based sumo association and joined the Inagawa stable. However, he never progressed beyond the jonidan division and in 1884 he joined the rival Tokyo-based association with another trainee of Inagawa.

In Tokyo, he first joined Tamagaki stable and made his debut the following month. During his career, he changed stables several times, eventually joining Tomozuna stable on a permanent basis. As a wrestler, he competed with fellow newcomers Konishiki and Nishinoumi, gaining popularity as a talented technical wrestler and being known for his leg tripping based techniques. Championships for the best record in a tournament were not recognized or awarded before the 1909 summer tournament and the above championships that are labelled "unofficial" are historically conferred. For more information see yūshō.