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.
Westside Xtreme Wrestling
On July 18, 2015, New Japan Pro-Wrestling announced a working relationship with wXw as part New Japan's international expansion plans Which ended in 2016 due to wXw working with to much promotions and not having any Collaborated events. And not being in NJPW events in Europe, Also not having wXw titles being defended in NJPW events and no talent exchanges.