Sakaigawa Namiemon (境川 浪右衛門, May 28, 1841 – September 16, 1887) was a Japanese professional sumo wrestler from Katsushika District, Shimōsa Province.

[2] Masakichi joined the Sakaigawa stable where he was trained by the eponymous ōzeki (who held that rank from 1857 to 1861) and began his career in November 1857.

Masakichi adopted the shikona, or ring name, of Konishikawa (小西川) before changing it for Shihoyama (四方山) and Masuizan (増位山).

[2] Despite his small stature, Sakaigawa had a drum belly and a strong body, and rose steadily through the ranks.

Following his promotion, he changed his ring name to Sakaigawa Namiemon (境川 浪右衛門) and became the head of his stable while still competing.

In 1877, the Emperor Meiji was scheduled to hold a tournament at the Shimazu clan's residence in Azabu, Tokyo.