An early version of this championship was introduced in 1983 for the winner of the IWGP League 1983. Since then, the championship was defended annually against the winner of the IWGP League of the year. The current IWGP Heavyweight Championship arrived only in 1987, replacing the old version. The current version is defended regularly and is the top championship of New Japan Pro-Wrestling. Throughout the history of the championship, several wrestlers have been forced to relinquish the title due to an inability to participate in title defenses. When a wrestler has been injured or unable to compete for other reasons, tournaments have been held to determine the new champion. In 2006, Brock Lesnar was stripped of the title for refusing to defend it, claiming he was owed money by NJPW. The company went on to crown a new champion, while Lesnar kept the physical belt. He signed with Antonio Inoki's Inoki Genome Federation in 2007, and lost the championship to Kurt Angle on the promotion's inaugural event. Angle later lost the belt in a unification match to the NJPW-recognized champion Shinsuke Nakamura in 2008.
Reigns
There have been seventy reigns shared among twenty-nine wrestlers with ten vacancies. Title changes happen at NJPW-promoted events. Big Van Vader, Salman Hashimikov, Scott Norton, Bob Sapp, Brock Lesnar, A.J. Styles, Kenny Omega and Jay White are the eight non-Japanese wrestlers to have held the title, with Hashimikov being the first and only Soviet-born champion, while Omega is the first Canadian champion. Antonio Inoki was the first champion in the title's history. Hiroshi Tanahashi holds the record for most reigns with eight. Kazuchika Okada holds the record for the longest reign in the title's history at 720 days during his fourth reign, over which he successfully defended the title 12 times, more defenses than any other title holder. Kensuke Sasaki's fourth reign of 16 days is the shortest in the title's history. Over his five reigns, Okada successfully defended the title 30 times, the most of any champion. Big VanVader's first and third reigns, Salman Hashimikov's only reign, Riki Choshu's first reign, Tatsumi Fujinami's third and fifth reigns, Masahiro Chono's only reign, Genichiro Tenryu's only reign, Scott Norton's second reign, Hiroyoshi Tenzan's first and third reigns, Kensuke Sasaki's fourth reign, Kazuyuki Fujita's third reign, Manabu Nakanishi's only reign, Hiroshi Tanahashi's eighth reign, and Jay White's only reign are all tied for least successful defenses at zero. Evil is the current champion in his first reign. He won the Intercontinental and Heavyweight championships by defeating Naito on July 12, 2020 at Dominion 2020, where both the IWGP Heavyweight and Intercontinental were on the line.
