9, international convention

The commendation ceremony of a world soft tennis championship

   Now, there are four globally famous conventions in soft tennis. It is four conventions of World Soft Tennis Championship, the Asian Games, an East Asian Game, and the Asia Soft Tennis Championship. It is held internationally and especially large-scale these four conventions are called "four typical International Convention." These conventions are conventions which determine the champion of a soft tennis community, and are important as a place which can moreover see the new possibility and game nature of soft tennis. In addition, the Asian Games and an East Asian Game are combined-exercises conventions. There are other conventions, such as the Emperor's Cup, the all Japan soft tennis championship, National Athletic Meet, the all Japan member-of-society soft tennis championship, and a university all Japan student soft tennis championship. The Emperor's Cup and the all Japan soft tennis championship are the championships which determine doubles No.1 of Japan of the soft tennis held once per year. Japan Soft Tennis Association is sponsoring these conventions. The champion of this convention becomes the ranking top of that year. Qualifications for entry are a ranking higher rank player of conventions, such as a member-of-society championship, an East Japan championship, a western-part-of-Japan championship, the inter-high school championships, and a national junior high school convention. The Emperor's Cup and an Empress cup are presented to a man-and-woman victorious team. In the convention, also when doubles and singles were performed, it was in prewar days, but it is held as an all Japan singles championship now in spring. This convention also becomes the material of the representative selection of Japan which participates to International Convention, such as the world championship and the Asian Games. A "world soft tennis championship" is the world championship of the soft tennis held every four years. The origin of the world soft tennis championship which are the world 4 major conventions is the Asia championship held 9 times by 1973. The world soft tennis championship is held from the year by which the international tennis-played-with-a-soft-rubber-ball league (ISTF) was established in 1975. The 1st world championship was held in the U.S. Hawaii state. In addition, the Asia championship is the convention which the "Asia tennis-played-with-a-soft-rubber-ball league" was established by three nations of Japan, South Korea, and Taiwan in 1955, and was held by the league by three-nation confrontation in 1956. In addition, the new Asia championship was held in Nagoya in 1988, and it is held by quadrennial. 

Reference：wikipedia, japan soft tennis association