The 2007 US Sumo Open builds upon a great tradition, starting with the inaugural US Sumo Open in 2001. On April 7, 2007, over 2,000 people packed the lower levels of the Los Angeles Sports Arena for the pre-eminent competition. Over 40 of the world's best international sumo athletes competed, but only one athlete was undefeated in his own weight class and in the openweight class!