Devitt is previously known for his work in New Japan Pro Wrestling (NJPW). During his time there, he was a three-time IWGP Junior Heavyweight Champion and six-time IWGP Junior Heavyweight Tag Team Champion, holding the title with Minoru twice and with Ryusuke Taguchi four times. Devitt was also the winner of the Best of the Super Juniors tournament twice in 2010 and 2013. With New Japan's working promotion with Consejo Mundial de Lucha Libre (CMLL), he made appearances for them and won the NWA World Historic Middleweight Champion once. Devitt was the leader of the Bullet Club stable.