Lamont Roach Jr. has some advice for Gervonta Davis if they ever rematch ... chill with the hair grease!!
TMZ Sports recently caught up with the lightweight boxing contender at Fanatics Fest in NYC ... when we asked about the status of his fight with Tank after their controversial first scrap.

You may recall, the fight ended in a majority draw (meaning Tank kept his title), though many fans felt Lamont won outright.