Tanahashi returned to the ring on June 11 at Dominion 6.11 in Osaka-jo Hall, where he defeated Tetsuya Naito to win the IWGP Intercontinental Championship for the second time. Tanahashi then entered the 2017 G1 Climax, where he finished with a record of six wins and three losses, failing to make it to the finals due to losing to Naito in their final round-robin match on August 11. Tanahashi then successfully defended the Intercontinental Championship against Zack Sabre Jr. on September 16 at Destruction in Hiroshima and Kota Ibushi on November 5 at Power Struggle, avenging two losses he had suffered during the 2017 G1 Climax. Following the Ibushi match, Tanahashi was attacked by the returning Jay White, who challenged him to a title match on January 4, 2018, at Wrestle Kingdom 12 in Tokyo Dome. After being sidelined with a legitimate knee injury, Tanahashi returned on December 18 to assure he would be wrestling at Wrestle Kingdom 12, at which point he was again attacked by White. On January 4, 2018, Tanahashi defeated White to retain his title. The next day, at New Year's Dash, he was attacked by Minoru Suzuki. On January 27, 2018, at The New Beginning in Sapporo, Tanahashi dropped the title to Suzuki, ending his reign at 230 days.