Tomoyuki Oka
Acting · Born 1991-06-12 · age 35 · Maebashi, Gunma Prefecture, Japan
Tomoyuki Oka, better known by his ring name Great-O-Khan, is a Japanese professional wrestler signed to New Japan Pro-Wrestling (NJPW), where he is a member of the United Empire stable. A former NJPW World Television Champion and final official King of Pro Wrestling Champion, he is also a four-time IWGP Tag Team Champion with Jeff Cobb (2x), Aaron Henare, and Callum Newman. In 2026, he won the NEVER Openweight 6-Man Tag Team Championship alongside Henare and Will Ospreay. In recognition of his in-ring ability, he received Tokyo Sports’ Technique Award in 2021, Fighting Spirit Award in 2022, and Best Tag Team Award in 2022 alongside United Empre stablemate Jeff Cobb. Oka began training with NJPW in 2015 and debuted in 2016 as part of the company’s Young Lion system before heading to the United Kingdom for an excursion with Revolution Pro Wrestling (RevPro), where he reinvented himself as Great-O-Khan and later captured the Undisputed British Heavyweight Championship. He returned to NJPW in 2020 as the first major member of Will Ospreay’s United Empire faction and quickly became one of the promotion’s most distinctive heavyweights, blending amateur wrestling, submission grappling, and his eccentric imperial persona. Known for his unconventional matches and crowd interaction, O-Khan gained further momentum in 2024 after reaching the G1 Climax playoffs and unsuccessfully challenging Tetsuya Naito for the IWGP World Heavyweight Championship. In 2025, he was ranked No. 137 in the Pro Wrestling Illustrated PWI 500.
Titles
All Elite Wrestling: Dynamite
My Dad Is a Heel Wrestler
AEW x NJPW Presents Forbidden Door 2022
NJPW G1 Climax 33: Day 16
NJPW G1 Climax 33: Day 17
NJPW Dominion 6.11 in Osaka-jo Hall
NJPW Wrestle Kingdom 15: Night 1
NJPW x AEW x CMLL x ROH x STARDOM: Wrestle Dynasty
NJPW Wrestle Kingdom 20
NJPW Wrestle Kingdom 17: Night 1 in Tokyo Dome
NJPW New Year Dash !! 2026
NJPW Sakura Genesis 2026
NJPW Road to G1 Climax 36 - Day 3
Stardom on Stardom World
NJPW G1 Climax 33: Day 11
NJPW G1 Climax 33: Day 1
NJPW G1 Climax 33: Day 13
NJPW Wrestling Dontaku 2022
NJPW Dominion 6.12 In Osaka-Jo Hall
NJPW x STARDOM: Historic X-Over
NJPW Sakura Genesis 2024
NJPW Power Struggle ~ Super Junior Tag League 2023
NJPW New Year Dash !! 2018
NJPW Wrestling Dontaku 2017
NJPW x STARDOM: Historic X-Over II
NJPW Wrestle Kingdom 19
NJPW The New Beginning In Osaka 2025
NJPW Blue Justice XV - Wrestling Life 40th Anniversary Yuji Nagata
NJPW Sakura Genesis 2017
NJPW Tanahashi Jam
NJPW New Japan Soul 2025 - Day 8
NJPW Wrestling Dontaku 2021 - Night 1
NJPW Wrestling Dontaku 2021 - Night 2
NJPW Road to The New Beginning 2026 - Day 1
NJPW Yuji Nagata Produce Blue Justice XVII ~ Aoyi Transition ~
NJPW Road to The New Beginning 2026 - Day 2
NJPW Road to The New Beginning 2026 - Day 6
NJPW The New Beginning In Osaka 2026
NJPW Road to The New Beginning 2026 - Day 10
NJPW New Japan Cup 2026 - Day 1
NJPW 54th Anniversary Event & New Japan Cup 2026 - Day 3
NJPW New Japan Cup 2026 - Day 4
NJPW New Japan Cup 2026 - Day 7
NJPW New Japan Cup 2026 - Day 8
NJPW New Japan Cup 2026 - Day 9
NJPW New Japan Cup 2026 - Day 10
NJPW New Japan Cup 2026 - Day 12 (Final)
NJPW Wrestling Dontaku 2026 - Day 1
NJPW Wrestling Dontaku 2026 - Day 2
NJPW Road to Wrestling Dontaku 2026 - Day 1
NJPW Dominion 6.14 In Osaka-Jo Hall
NJPW Best of the Super Junior 33 - Day 14 (Final)
NJPW G1 Climax 36 - Day 1
NJPW G1 Climax 36 - Day 2
NJPW Tiger Mask's Retirement Match
NJPW Wrestle Grand Slam in MetLife Dome: Night 2
NJPW G1 Climax 31: Day 1
NJPW G1 Climax 31: Day 3
NJPW G1 Climax 31: Day 5
NJPW G1 Climax 31: Day 7