Champion Carnival
From 1959 to 1972, the Japan Pro Wrestling Alliance (JWA), run by Rikidōzan, held a tournament called World League (also known as the "World Big League"), which featured both Japanese and foreign professional wrestlers. Rikidōzan himself dominated the annual tournament early on, however, after his death in 1963, the tournament was won six times by Giant Baba and once by Antonio Inoki. JWA folded shortly after both Baba and Inoki left the promotion to create All Japan Pro Wrestling (AJPW) and New Japan Pro-Wrestling (NJPW), respectively. Both men took the concept of World League with them to their new promotions, with Baba creating the "Champion Carnival" in 1973 and Inoki creating the World League in 1974, later renaming it G1 Climax.
Big Japan Pro Wrestling
Big Japan has had interpromotional feuds with both New Japan Pro-Wrestling (NJPW) and Combat Zone Wrestling (CZW). These were both kayfabe feuds that were done in order to generate more income for both companies. During late 1996 and early 1997, BJW entered into an agreement with NJPW. Being a relatively new promotion, BJW was in need of mainstream publicity. NJPW agreed to a feud, which would allow Big Japan wrestlers to appear in their company and use New Japan's popularity to give exposure to their company. In return, Big Japan agreed to lose the feud and the majority of the interpromotional matches, therefore strengthening the New Japan brand. The situation provided an interesting clash of wrestling styles, as NJPW often favored a strong style of competition. The two promotions held Wrestling World 1997, the biggest event during the interpromotional feud and the fifth January 4 Tokyo Dome Show. In the late 1990s and into the 2000s, BJW competed against CZW. CZW was a relatively new American promotion at the time, and also largely focused on an extreme style of wrestling. Wrestlers feuded in both companies having matches in the United States and Japan. During the CZW feud, top star Tomoaki Honma departed the company to become a freelancer.