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Sumo (相撲 Sumō, alternatively 大相撲 Ōzumō), or Sumo wrestling, is a competition contact sport where two wrestlers or rikishi face off in a circular area. The sport is of Japanese origin and is surrounded by ceremony and ritual. The Japanese consider Sumo a gendai budō: a modern Japanese martial art, even though the sport has a history spanning many centuries.
At the top of the sumo wrestlers' hierarchy (banzuke) stands the yokozuna (grand champion). At the moment, there is only one yokozuna, Asashoryu from Mongolia. Once a wrestler reaches the rank of yokozuna, he cannot lose it anymore. However, he is expected to retire as soon as his results are starting to worsen.
Six tournaments are held every year, each one lasting 15 days. Three of the tournaments are held in Tokyo (January, May, September), and one each in Osaka (March), Nagoya (July) and Fukuoka (November).