IWGP Junior Heavyweight Championship
On 11 December, Devitt made his third successful IWGP Junior Heavyweight Championship defense, defeating another New Japan outsider, Davey Richards. On 4 January 2011, at Wrestle Kingdom V in Tokyo Dome, Devitt successfully defended the IWGP Junior Heavyweight Championship against Kota Ibushi, avenging the loss from the IWGP Junior Heavyweight Tag Team Championship match. On 23 January at "Fantastica Mania 2011", a New Japan and Consejo Mundial de Lucha Libre (CMLL) co–promoted event in Tokyo, Devitt and Taguchi defeated Kenny Omega and Kota Ibushi to regain the IWGP Junior Heavyweight Tag Team Championship, making Devitt a double IWGP champion for the second time. Devitt continued his streak of defending the IWGP Junior Heavyweight Championship against New Japan outsiders, when he successfully defended the title against Taka Michinoku on 20 February and Kushida on 19 March. In May, Devitt took part in the Invasion Tour 2011, New Japan's first tour of the United States, during which he successfully defended the IWGP Junior Heavyweight Championship against Low Ki on 14 May in New York City and the IWGP Junior Heavyweight Tag Team Championship against the Strong Style Thugz (Homicide and Low Ki) on 15 May in Philadelphia, Pennsylvania. On 26 May, Devitt entered the 2011 Best of the Super Juniors tournament. After losing his opening match against Davey Richards, Devitt went on a seven match winning streak to finish first in his block in the round-robin stage of the tournament. On 10 June, Devitt was eliminated from the tournament in the semifinals by his own tag team partner, Ryusuke Taguchi. On 18 June at Dominion 6.18, Devitt lost the IWGP Junior Heavyweight Championship to Best of the Super Juniors winner, Kota Ibushi, ending his reign at 364 days.