Kushida participated in the annual Best of the Super Juniors tournament, which began on May 30, 2010.
He participated in seven matches winning four out of them, giving him a total of eight points, just coming shy of the semi finals.
Kushida also participated in the new tag team tournament called Super J Tag Tournament, Kushida partnered with Gedo.
The pair first went up against Kota Ibushi and Austin Creed, Kushida pinned Austin to advance to the semi final.
However the pair lost to Ryusuke Taguchi and Prince Devitt in the semi final so were out of the tournament.
Kushida then went on to team up with Hiroshi Tanahashi and Tajiri to compete in J Sports Crown Openweight 6 Man Tag Tournament 2010, the team beat Chaos to progress to the finals where they were eventually beaten by Hirooki Goto, Prince Devitt, and Ryusuke Taguchi.
Kushida participated in Super J Tag League teaming up with Akira in block B, the pair won two matches and lost two matches amassing a total of four points, missing out on the final by two points.

On February 25, 2011, it was announced that Kushida, with Tajiri's blessing, would be leaving Smash and becoming a full-time member of the New Japan roster, beginning on April 1.
On March 19 Kushida unsuccessfully challenged Prince Devitt for the IWGP Junior Heavyweight Championship.
On May 26, Kushida entered the 2011 Best of the Super Juniors tournament.
After winning five out of his eight-round robin stage matches, he finished fourth out of the nine wrestlers in his block, narrowly missing the semifinals of the tournament.
Kushida then went on to compete in J Sports Crown Openweight 6 Man Tag Tournament 2011 with Hiroshi Tanahashi and Máscara Dorada, however the trio were beaten in the second round by Jyushin Thunder Liger, Karl Anderson and Giant Bernard.
On August 27, 2011, he participated in the Destroyer Cup, a special battle royal at All Together.
On September 19, Kushida was set to challenge Kota Ibushi for the IWGP Junior Heavyweight Championship, but a week earlier, Ibushi was forced to pull out of the match and vacate the title, after dislocating his left shoulder.
Kushida was then booked in a decision match against former champion Prince Devitt to determine a new champion.
On September 19, Kushida was defeated by Prince Devitt in a match for the vacant IWGP Junior Heavyweight Championship.
On November 12 at Power Struggle, Kushida and Tiger Mask unsuccessfully challenged Davey Richards and Rocky Romero for the IWGP Junior Heavyweight Tag Team Championship.

At Wrestle Kingdom VI, Kushida participated in his first match on January 4 Dome Show by teaming up with Jyushin Thunder Liger, Tiger Mask IV and Mascara Dorada to defeat Atlantis, Valiente and Suzuki-gun (Taichi and Taka Michinoku).
Liger won the match by pinning Valiente.
On January 21, Kushida returned after the NJPW break period to take part in the Fantastica Mania 2012 events, teaming with Hirooki Goto, beating Máscara Dorada and Rush.
The second night Kushida lost to Máscara Dorada in a match for the CMLL World Welterweight Championship.
At The New Beginning, Kushida along with Seigigun (Wataru Inoue and Yuji Nagata), Tiger Mask & Togi Makabe were defeated in a ten-man tag team elimination match by Suzuki-gun (Lance Archer, Minoru Suzuki, Taichi, Taka Michinoku and Yoshihiro Takayama).
On 27 May, Kushida entered the 2012 Best of the Super Juniors tournament, after a strong start beating three of his first four opponents, which included Prince Devitt, Kushida would go on to lose most of his remaining matches which, in the end, gave him eight points, once again narrowly missing out on the semi final.
On July 22, Kushida picked up a big win, when he defeated IWGP Junior Heavyweight Champion Low Ki in a non-title match.
However, Low Ki was first scheduled to defend his title against Kota Ibushi and when, on July 29, Ibushi became the new champion, Kushida stepped up and challenged him to the title match originally scheduled for September 2011.
On August 26, Kushida returned to the United States, when he wrestled at a Sacramento Wrestling Fed
Kushida participated in the annual Best of the Super Juniors tournament, which began on May 30, 2010. He participated in seven matches winning four out of them, giving him a total of eight points, just coming shy of the semi finals. Kushida also participated in the new tag team tournament called Super J Tag Tournament, Kushida partnered with Gedo. The pair first went up against Kota Ibushi and Austin Creed, Kushida pinned Austin to advance to the semi final. However the pair lost to Ryusuke Taguchi and Prince Devitt in the semi final so were out of the tournament. Kushida then went on to team up with Hiroshi Tanahashi and Tajiri to compete in J Sports Crown Openweight 6 Man Tag Tournament 2010, the team beat Chaos to progress to the finals where they were eventually beaten by Hirooki Goto, Prince Devitt, and Ryusuke Taguchi. Kushida participated in Super J Tag League teaming up with Akira in block B, the pair won two matches and lost two matches amassing a total of four points, missing out on the final by two points.
On February 25, 2011, it was announced that Kushida, with Tajiri's blessing, would be leaving Smash and becoming a full-time member of the New Japan roster, beginning on April 1. On March 19 Kushida unsuccessfully challenged Prince Devitt for the IWGP Junior Heavyweight Championship. On May 26, Kushida entered the 2011 Best of the Super Juniors tournament. After winning five out of his eight-round robin stage matches, he finished fourth out of the nine wrestlers in his block, narrowly missing the semifinals of the tournament. Kushida then went on to compete in J Sports Crown Openweight 6 Man Tag Tournament 2011 with Hiroshi Tanahashi and Máscara Dorada, however the trio were beaten in the second round by Jyushin Thunder Liger, Karl Anderson and Giant Bernard. On August 27, 2011, he participated in the Destroyer Cup, a special battle royal at All Together. On September 19, Kushida was set to challenge Kota Ibushi for the IWGP Junior Heavyweight Championship, but a week earlier, Ibushi was forced to pull out of the match and vacate the title, after dislocating his left shoulder. Kushida was then booked in a decision match against former champion Prince Devitt to determine a new champion. On September 19, Kushida was defeated by Prince Devitt in a match for the vacant IWGP Junior Heavyweight Championship. On November 12 at Power Struggle, Kushida and Tiger Mask unsuccessfully challenged Davey Richards and Rocky Romero for the IWGP Junior Heavyweight Tag Team Championship.
At Wrestle Kingdom VI, Kushida participated in his first match on January 4 Dome Show by teaming up with Jyushin Thunder Liger, Tiger Mask IV and Mascara Dorada to defeat Atlantis, Valiente and Suzuki-gun (Taichi and Taka Michinoku). Liger won the match by pinning Valiente. On January 21, Kushida returned after the NJPW break period to take part in the Fantastica Mania 2012 events, teaming with Hirooki Goto, beating Máscara Dorada and Rush. The second night Kushida lost to Máscara Dorada in a match for the CMLL World Welterweight Championship. At The New Beginning, Kushida along with Seigigun (Wataru Inoue and Yuji Nagata), Tiger Mask & Togi Makabe were defeated in a ten-man tag team elimination match by Suzuki-gun (Lance Archer, Minoru Suzuki, Taichi, Taka Michinoku and Yoshihiro Takayama). On 27 May, Kushida entered the 2012 Best of the Super Juniors tournament, after a strong start beating three of his first four opponents, which included Prince Devitt, Kushida would go on to lose most of his remaining matches which, in the end, gave him eight points, once again narrowly missing out on the semi final. On July 22, Kushida picked up a big win, when he defeated IWGP Junior Heavyweight Champion Low Ki in a non-title match. However, Low Ki was first scheduled to defend his title against Kota Ibushi and when, on July 29, Ibushi became the new champion, Kushida stepped up and challenged him to the title match originally scheduled for September 2011. On August 26, Kushida returned to the United States, when he wrestled at a Sacramento Wrestling Fed
Yujiro Kushida