Hironaka made his professional mixed martial arts debut in 2001 for the Shooto promotion and compiled a record of 10-2 with notable wins over Nick Diaz, Ryan Schultz, and Renato Verissimo before being signed by the UFC.[1]
Ultimate Fighting Championship
Hironaka made his UFC debut at UFC 64 on October 14, 2006 against Jon Fitch. Hironaka lost via unanimous decision.
Hironaka faced Canadian Jonathan Goulet at UFC 83 and was defeated in the second round via TKO. Hironaka was then released from the promotion.
Post-UFC
In his first fight since his release from the UFC, Hironaka defeated Motoki Miyazawa at Dream 5 via TKO due to a cut. Hironaka then faced Hayato Sakurai at Dream 6 and was defeated via unanimous decision.
After the loss to Sakurai, Hironaka dropped down to the Lightweight division and won his next four consecutive fights, capturing the Cage Force Lightweight Championship after it had been vacated by Mizuto Hirota.[2]
After dropping two consecutive losses to Katsunori Kikuno and Satoru Kitaoka, respectively, Hironaka bounced back with two consecutive wins, warranting a title shot for the newly vacated Shooto World Lightweight Championship against Kotetsu Boku. Hironaka won via unanimous decision, and then defended his title against Giovani Diniz via first-round TKO.
Hironaka then fought at Pancrase: 257 on March 30, 2014 against Isao Kobayashi. Hironaka was defeated via TKO in the third round.
Grappling career
In 2004, Hironaka fought against Shinya Aoki in a superfight at the Reversal Cup. Hironaka was submitted with a flying armbar that broke his arm, preventing him from competing for several months.[3]