Ted Ginn Jr. tells TMZ Sports if he wasn't so damn good at football ... he'd be an Olympic track athlete with a gold medal already on his resume -- saying he's beaten Usain Bolt before! The new Chicago Bear spoke with us this week about his track past ... and says he had straight-up OLYMPIC speed…

Anyone wondering if New Orleans Saints receiver Tedd Ginn Jr. is a fan of his quarterback, Drew Brees, you're about to get your answer ... and that answer is almost religious. Ginn Jr. and Brees have been running mates for a couple years now, so when we talked to the speed burner from Ohio State…