Israel Adesanya just earned the first submission win of his career ... 'cause the UFC star made Logan Paul tap out during a fierce training session!!
The Maverick has been working out with Izzy, the middleweight champion, and pound-for-pound king Alexander Volkanovski in Puerto Rico this week ... where the two champs have been helping the YouTuber-turned-boxer work on his MMA skills.
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By the looks of it, it's been a humbling experience for Logan ... but what do you expect when he's going up against two of the baddest dudes in combat sports?