Wakashimazu Mutsuo

In October 2017 he was injured in a fall from his bicycle in Funabashi, Chiba, and underwent emergency surgery for a cerebral contusion. He stepped down from his judging duties and did not run for re-election to the Sumo Association board in 2018.

In September 2010 he was demoted in the Sumo Association's hierarchy after he accepted lodgings in Osaka for the Haru tournament the previous March from a company president connected to gangsters. In addition, two of his wrestlers, Matsutani and the sandanme ranked Wakarikido, were suspended for two tournaments for illegal betting on baseball. However, he joined the Board of Directors in 2014, and was re-elected in 2016. Also in 2016 he became head of the judging department.

After his retirement Wakashimazu set up his own training stable, Matsugane, early in 1990. The retirement of Harunoyama in November 2006 left the stable with no wrestlers in the top two divisions. He finally produced another sekitori in March 2010 when Matsutani (now Shōhōzan) was promoted to jūryō. In 2014 he switched his toshiyori or elder name to a more prestigious one, Nishonoseki, and renamed his stable accordingly.

He has been married to former pop/enka singer Mizue Takada since 1985. Upon his promotion to the top division in 1981 he mentioned Takada in an interview as an ideal wife, four years before it happened.

Wakashimazu was popular with the crowds and his lean and swarthy appearance led to him being nicknamed the "Black Panther", His best year was in 1984, when he took two top division tournament championships in March and July, the second with a perfect 15–0 record, but he could manage only third place in the September 1984 tournament and missed out on promotion to the highest rank of yokozuna. Nevertheless he finished 1984 with 71 wins out of a possible 90, more than any other wrestler (the three yokozuna at the time, Kitanoumi, Chiyonofuji and Takanosato were all restricted by injury during the year). March 1985 saw his sixth and final runner-up performance. From November 1985 his results started to decline, and in an attempt to change his luck he switched from his trademark kelly green mawashi to a light blue one, but soon switched back when results did not improve. He retired in July 1987 at the age of thirty, leaving the Futagoyama stable without anyone in the san'yaku ranks for the first time in over fifteen years.

He came from a family of farmers. He was a classmate of Tsuyoshi Nagabuchi at junior high school. Wakashimazu wrestled for Futagoyama stable, joining in March 1975. Unlike most professional sumo wrestlers, he did not join from junior high school but instead joined after completing high school. He was a high school sumo champion but needed some persuasion from his stablemaster that he would be able to put on enough weight to succeed in professional sumo. He made his debut alongside future top division regulars Daijuyama and Kirishima. He reached the salaried sekitori ranks in March 1980 upon promotion to the jūryō division and reached the top makuuchi division in January 1981. He scored 10 wins in his makuuchi debut. He moved quickly through the division, winning five special prizes, two for Fighting Spirit and three for Technique. He reached sumo's second highest rank of ōzeki in January 1983 after two runner-up performances and 34 wins out of 45 in the three preceding tournaments. After a 10–5 in his ōzeki debut, he broke his leg in the following tournament, but made a remarkably quick recovery, with a 13–2 score and runner-up honours in the next tournament in May 1983.

Wakashimazu Mutsuo (若嶋津 六夫 ) (born 12 January 1957 as Mutsuo Hidaka) is a Japanese former sumo wrestler from Nakatane, Kagoshima, Japan. His highest rank was ōzeki. He won two top division yūshō or tournament championships. He retired in 1987 and is now the head coach of Nishonoseki stable.