After five fights, Demetrious Johnson is the ONE Championship flyweight champion but admits he’s still getting used to an important aspect of the promotion’s ruleset. Prior to his ONE Champion debut in early 2019, Johnson spent eight years fighting for WEC/UFC, which doesn’t allow knees to a grounded opponent.
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Demetrious Johnson breaks down difference between two fights vs. Adriano Moraes – MMA Junkie