In the dynamic world of BJJ and submission grappling, certain names become synonymous with innovation, daring techniques, and a relentless pursuit of the finish. Among these revered figures, Masakazu Imanari stands as a true icon, a quiet storm whose unique approach to leg locks has left an indelible mark on the martial arts landscape. From humble beginnings to becoming the “Ashikan Judan” (Master of Leg Locks), Imanari’s journey is a testament to dedication, creativity, and the power of specialized skill.

The Imanari Roll: The Gateway To Leg Entries
Ask any grappler about Masakazu Imanari, and the first thing that often comes to mind is the move that bears his name, the Imanari Roll.
This audacious entry to leg entanglements revolutionized how grapplers approached the lower body. At its core, the Imanari Roll is a dynamic, often surprising spinning entry from a standing or semi-standing position directly into a leg entanglement, typically aimed at achieving an outside heel hook or other leg lock.
The technique itself involves taking a small step with one leg, then dropping the opposite shoulder and performing a forward roll or somersault, using the momentum to spin around and capture an opponent’s leg. The beauty of the Imanari Roll lies in its suddenness and its ability to bypass traditional guard passing. It allows the attacker to quickly close distance, disrupt the opponent’s balance, and immediately transition to a dominant leg lock attacking position, often before the opponent even fully comprehends what is happening. While initially viewed as a flashy, high-risk maneuver, its effectiveness has been proven time and again at the highest levels of competition, becoming a staple in the arsenals of many modern grapplers.
Early Life And The Path To Martial Arts
Born in Tokyo, Japan, Masakazu Imanari’s early life didn’t necessarily hint at the unique path he would forge in combat sports. Unlike many martial arts prodigies who start training from a very young age, Imanari’s serious foray into martial arts began later. He initially dabbled in Judo, a common starting point in Japan, but it was the burgeoning world of mixed martial arts and submission grappling that truly captured his imagination.
In the late 1990s and early 2000s, Japan was a hotbed for combat sports, with promotions like PRIDE FC and Shooto showcasing a diverse range of fighting styles. This environment exposed Imanari to the effectiveness of grappling and submissions, particularly the nascent art of Brazilian Jiujitsu. He began training in earnest, immersing himself in the intricacies of ground fighting and developing a keen interest in submission finishes.


Development As A Martial Artist: Specialization And Innovation
Imanari’s journey as a martial artist is characterized by a relentless pursuit of specialized skill. While competent in all aspects of grappling, he truly found his niche in leg attacks. This wasn’t merely a preference, it became his identity. He dedicated countless hours to dissecting the mechanics of leg locks, finding innovative entries, and developing a deep understanding of their application.
His professional MMA career began in 2000, primarily fighting in Shooto and later in promotions like DEEP, DREAM, and ONE Championship. Despite often being physically smaller than his opponents, Imanari consistently found ways to impose his game, primarily through his dangerous leg lock entries and transitions. His fights became known for their excitement and unpredictability. Spectators knew that at any moment, Imanari could drop into a roll and snatch a limb.
His unique style, combined with a seemingly unassuming demeanor, earned him the nickname “Ashikan Judan,” meaning “Master of Leg Locks”. This wasn’t just a catchy moniker; it reflected his unparalleled expertise and the fear he instilled in opponents regarding their lower limbs. He competed against a who’s who of lighter-weight fighters, often scoring highlight-reel submission victories that cemented his legendary status.
What Is Masakazu Imanari Doing Now?
Even as he progresses in his career, Masakazu Imanari remains an active and influential figure in the martial arts community. While his days of competing regularly in high-profile MMA bouts might be winding down, he continues to showcase his skills in submission grappling events and special appearances.
Imanari still trains diligently, constantly refining his techniques and exploring new variations of leg entanglements.


He often participates in exhibition matches and grappling superfights, delighting fans with his signature rolls and submission attempts. He is also involved in coaching and sharing his vast knowledge with the next generation of grapplers. His clinics and seminars are highly sought after by students eager to learn the nuances of his unique leg lock system
Masakazu Imanari’s legacy is more than just a move, it’s a philosophy. It’s about finding your strength, specializing, and having the courage to implement unconventional techniques that disrupt the status quo. His influence is evident in every gym where a grappler attempts an Imanari Roll, a testament to a quiet Japanese master who rolled his way into the annals of grappling greatness.

