Seiya Sanada , better known by his mononymous ring name Sanada, is a Japanese professional wrestler. He is currently signed to New Japan Pro-Wrestling (NJPW), where he is a member of the Just 5 Guys stable. He is a former and longest-reigning IWGP World Heavyweight Champion.

The IWGP World Heavyweight Championship is a professional wrestling world heavyweight championship owned by the New Japan Pro-Wrestling (NJPW) promotion. "IWGP" is the acronym of NJPW's governing body, the International Wrestling Grand Prix . The championship was created on March 1, 2021, by the unification of the IWGP Heavyweight Championship and the IWGP Intercontinental Championship. The current champion is Jon Moxley, who is in his first reign.