He has also worked for American promotions Ring of Honor (ROH) and Full Impact Pro (FIP), winning the latter's World Heavyweight Championship.

In youth he would play baseball, which he started in the third grade of elementary school, he served as a catcher who was assigned the 4th and 5th batters and won the eastern district of Kumamoto, his hometown.

At Kumamoto City Nishihara Junior High School, he joined the basketball club, served as a center forward in the position, and was appointed captain in the third year.

Shiozaki entered the Pro Wrestling Noah dojo in 2003[6] and according to the commentators from the event Universal Uproar, was the only man to graduate in his class as well as being the youngest wrestler on the roster.

After Kobashi was forced out of action due to cancer, Shiozaki teamed briefly with Tamon Honda but was again defeated by Noah's top wrestlers until he finally broke his losing streak by pinning Ricky Marvin.

On June 14, reigning GHC Heavyweight Champion Jun Akiyama was forced to vacate the title due to herniated discs in his back.

On January 26, 2013, Shiozaki, Atsushi Aoki, Jun Akiyama, Kotaro Suzuki and Yoshinobu Kanemaru, all of whom had quit Noah at the same time, announced that they had joined All Japan Pro Wrestling (AJPW), forming the "Burning" stable.

[24] On March 17, Shiozaki and Akiyama defeated Get Wild (Manabu Soya and Takao Omori) to win the World Tag Team Championship.

[26] On July 5, following a mass exodus led by Keiji Mutoh, it was announced that Shiozaki, along with the rest of Burning, had signed an exclusive contract with All Japan.

[27] Afterwards, Shiozaki set his sights on the Triple Crown Heavyweight Championship, defeating reigning champion Suwama in a non-title Two Out of Three Falls match on July 14, the launching day of the post-Mutoh All Japan.

[29] In September, Shiozaki made it to the finals of the 2013 Ōdō Tournament, after wins over Burning stablemates Kotaro Suzuki and Yoshinobu Kanemaru as well as top World Tag Team Championship contender Joe Doering,[30][31][32] before losing to Akebono.

[38] In December, Shiozaki and Miyahara made it to the finals of the 2013 World's Strongest Tag Determination League, before losing to Evolution (Joe Doering and Suwama).

[40] In April, Shiozaki participated in the 2014 Champion Carnival, where he was leading his block before suffering a broken thumb, which forced him to pull out of the tournament and forfeit his final round-robin match with Jun Akiyama.

[41] On September 28, Shiozaki defeated Suwama in the finals to win the 2014 Ōdō Tournament and earn another shot at the Triple Crown Heavyweight Championship.

At the end of the show, Marufuji, after losing the GHC Heavyweight Championship to Sugiura, finally accepted Shiozaki's help in the war between Noah and Suzuki-gun.

[60] On December 2, Shiozaki and Maybach Taniguchi defeated Davey Boy Smith Jr. and Lance Archer to win GHC Tag Team Championship.

On August 26 Shiozaki and Atsushi Kotoge defeated Maybach Taniguchi and Naomichi Marufuji to win GHC Tag Team Championship.

In November, Shiozaki won his block in the 2017 Global League Tournament with a record of five wins and one loss and one draw, advancing to the finals.

From March until April, Kiyomiya and Shiozaki took part of the Global Tag League, finishing the tournament with three wins, one loss and three draws, advancing to the finals.

On April 29 at Great Voyage in Niigata, Kiyomiya and Shiozaki defeated The Aggression (Masa Kitamiya and Katsuhiko Nakajima) to win the GHC Tag Team Championship.

On December 7, Shiozaki and Nakajima defeated Kenoh and Masa Kitamiya in a tournament final to win the vacant GHC Tag Team Championship.

On January 6, 2019, Shiozaki and Nakajima received their rematch for GHC Tag Team Championship losing to Taniguchi and Hino, after their Hooligans stablemates interfered in the match.

Afterwards, on February 12, AXIZ faced GHC Tag Team Champions 50 Funky Powers (Muhammad Yone and Quiet Storm) in a non-title match.

On February 24, 2019, AXIZ defeated 50 Funky Powers (Muhammad Yone and Quiet Storm) to win the GHC Tag Team Championship for the second time.

On August 20, AXIZ faced Sugiura-gun (Kazushi Sakuraba and Takashi Sugiura) in a losing effort for the vacant GHC Tag Team Championship.

From September 18 and October 11, Shiozaki took part in the 2020 N-1 Victory, finishing the tournament with a record of two wins, and three losses, failing to advance to the finals, losing to Kaito Kiyomiya in their head-to-head match.

On February 12, 2021 at Destination, Shiozaki lost the GHC Heavyweight Championship to Keiji Mutoh, in his sixth title defense, ending his reign at 405 days.

Shortly after losing the title, on March 15, it was announced that Shiozaki would undergo surgery, after dislocating his right biceps tendon, forcing him to be sidelined for eight months.

After defeating Manabu Soya on March 13 at Great Voyage in Yokohama, Shiozaki began his true road to the GHC Heavyweight Championship.

At Majestic, Shiozaki teamed with Kaito Kiyomiya and Yoshiki Inamura in a losing effort to KONGOH (Kenoh, Katsuhiko Nakajima and Manabu Soya).