Gervonta Davis just got called out -- personally and professionally -- by one of the biggest rising stars in sports (and Oscar De La Hoya's prized prospect) who says he'll easily KO Tank ...
If Tank can stay out of trouble to even make the fight.
The kid talking the trash is Ryan Garcia ... a 16-0 lightweight contender who is signed to Oscar's Golden Boy Promotions banner, and who's the talk of the boxing world.
Garcia is being hailed as the next Oscar .