The ōzeki (大関), or champion rank, is immediately below yokozuna in the ranking system.
Until the yokozuna rank was introduced, ōzeki was the highest rank attainable.
Technically there must always be a minimum of two ōzeki on the
banzuke, one on the east side and one on the west. If there are fewer than two regular ōzeki in
`practice, then one or more yokozuna will be designated “yokozuna-ōzeki”.