Move over Ezekiel Elliott and Saquon Barkley ... Jamal Lewis says Lamar Jackson is the top runner in the NFL -- telling TMZ Sports he thinks the Ravens QB is a future Hall of Famer!
"It's like watching the era of Michael Vick all over again," Lewis says.
Jackson has been shredding through defenses all season ... and Lewis -- a legendary Baltimore running back -- tells us he doesn't think there's any fluke at all to Lamar's year so far.
In fact, Lewis says he believes Jackson is only scratching the surface of his potential .