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.
Wrestle Kingdom I
When New Japan Pro-Wrestling (NJPW) held the 2006 January 4 Tokyo Dome Show, Toukon Shidou Chapter 1, some saw it as a possible "end of an era". In recent years, the January 4 show, held annually since 1992, had been suffering from a drop in both interest and attendance and while the 2006 show drew 31,000 fans to the Tokyo Dome, only around 10,000 of them paid for their ticket. The show, however, was still considered a success due to high merchandise sales, allowing NJPW to keep the tradition alive for another year. NJPW had previously had success promoting interpromotional shows with All Japan Pro Wrestling (AJPW), and decided to partner with them again for the 2007 Tokyo Dome show in an effort to boost attendance numbers. The partnership was officially announced in a press conference on November 15, 2006. AJPW had recently partnered with Yuke's, the owners of NJPW, for the video game "Wrestle Kingdom". As a result, the 2007 January 4 Tokyo Dome show was dubbed "Wrestle Kingdom in Tokyo Dome". The name stuck and the annual January 4 Tokyo Dome show has been known as Wrestle Kingdom ever since.
The main event of the show was booked as a tribute to Shinya Hashimoto, who had died from cerebral hemorrhage on July 11, 2005. In the match, Hashimoto's Three Musketeers partners Keiji Mutoh and Masahiro Chono would take on Hiroyoshi Tenzan and Satoshi Kojima. Both teams had actually disbanded years earlier due to Mutoh and Kojima having jumped from NJPW to AJPW at the start of 2002, but Kojima and Tenzan had recently reunited for AJPW's 2006 Real World Tag League. Mutoh was said to have been negative towards the idea of turning the match into a Hashimoto tribute, but was convinced to go along with it on the day of the show.