Masakazu Imanari is an iconic submission specialist in Japanese MMA. Fighting for over two decades in organizations like PRIDE FC and ONE Championship, ", "The Leglock Yokai" has won 28 fights by submissions and, of course, originated the Imanari Roll.

Britain's Ash Williams is a Polaris World Champion and a two-time IBJJF European Open NoGi champion. Widely regarded as one of the best grapplers in the UK, Williams ttook on Imanari in this eagerly awaited BJJ superfight at Polaris 7 in 2018.

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