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Sumo wrestling is a competitive contact sport where two wrestlers (rikishi) attempt to force one another out of a circular ring (dohyo) or to touch the ground with anything other than the soles of the feet. The sport originated in Japan, the only country where it is practiced professionally.

The Japanese consider sumo a gendai budo (a modern Japanese martial art), though the sport has a history spanning many centuries. The sumo tradition is very ancient, and even today the sport includes many ritual elements, such as the use of salt for purification, from the days sumo was used in the Shinto religion.

Life as a rikishi is highly regimented, with rules laid down by the Sumo Association. Professional sumo wrestlers are required to live in communal "sumo training stables" known in Japanese as heya where all aspects of their daily lives, from meals to their manner of dress are dictated by strict tradition.

Grand Sumo tournaments last for 15 days and are held 6 times a year, Once in Nagoya, Osaka and Fukuoka, and three times a year at the Ryogoku Kokugikan in Tokyo. The Grand 2010 Sumo Tournaments in Tokyo are during the following dates:

2010 Grand Tournament Schedule: