Bellator star Roy Nelson says Greg Hardy can beat up Alex Volkov -- the 6'7" Russian badass -- on only 18 days notice ... as long as he can hit his inhaler between rounds!! ud83dude02ud83dudc80
Last week, TMZ Sports asked Nelson -- who fought Frank Mir this weekend at Bellator 231 -- if Hardy has a snowballs chance in hell of beating the 7th ranked heavyweight when they fight November 9 ... and the big man threw major shade at the Pro Bowler turned fighter.