三冠ヘビー級王座
On June 28, 2006, Nagata was announced as a participant in the 2006 G1 Climax, his eighth appearance in the tournament. Nagata challenged for the Triple Crown Heavyweight Championship at the January 4 Dome Show entitled Wrestle Kingdom in Tokyo Dome against the current Triple Crown champion, Minoru Suzuki. Nagata lost after Suzuki applied the Saka-otoshi. He did not submit, but was knocked-out by the hold.