"When he get in the NBA, within three years, I guarantee he's the scoring champ. GUARANTEE."

LaVar Ball is back to his old ways ... making a crazy prediction that his son will lead the league in scoring within 3 years ... and he ain't talking about Lonzo or LaMelo -- it's LiAngelo!!!

Papa Ball returned to FS1's "Undisputed" on Tuesday and let the takes fly ... like saying the Pelicans will beat LeBron James' Lakers in a potential playoff matchup.

However, that comment was pretty tame compared to the most scalding-hot take of all ... when LaVar guaranteed his middle son, Gelo, would take over the league if/when he jumps from the G-League to the NBA.