Did you know Megatron could transform into a PGA Tour golfer in retirement?
It's true ... at least that's according to Calvin Johnson himself, who tells TMZ Sports he's that good with a club in his hands!!!
The former Detroit Lions superstar is adamant he could make a real run at earning cash full-time at hitting fairways and greens in regulation ... if only he had just a little bit more free time on his hands.
"If I had the time to put the level of work that I did when I played football, I think I would be able to get there," the Hall of Famer said.