Jay Z -- Insane Advantage At Fantasy Football ... Says ESPN Expert

Jay Z might be the GREATEST fantasy football player alive ... so says ESPN's Matthew Berry ... who says the rap mogul might have more inside information than anyone else in the fantasy game.

FYI -- Berry is a fantasy football god ... one of the top FF experts in the world. In fact, he's been invited to Jay's live draft for the past 3 seasons in a row.

So, why does Hova have such an advantage?

"He knows EVERYONE in the league. There's no one he can't text to get info," Berry says.

The clip is great -- Berry also lists the ballers that Jay has invited into his ultra-exclusive league.