Which sumo wrestler won the first official tournament held after World War II?

Haguroyama Masaji won the first official sumo tournament held after World War II.

The tournament took place in November 1945, soon after Japan’s surrender and the end of the war. Haguroyama won the top-division championship with a perfect record, providing a notable moment of continuity for professional sumo during a period of national disruption.

Haguroyama was born in 1914 and reached the yokozuna rank in 1941. His career spanned the difficult wartime years, when tournaments were interrupted or affected by wider events. The November 1945 championship was held in Tokyo and is often identified as the first official tournament of the postwar era.

This fact can be confused with the first tournament held after the wartime cancellation of the May 1945 event, or with the first postwar tournament at a particular venue. It also differs from records involving Futabayama, the dominant champion of the late 1930s and early 1940s.