Boxing legend Sugar Ray Leonard has revealed a deep dark secret he’s been hiding for years….

The 55 year-old was molested at the young tender age of 15 by a “prominent Olympic boxing coach”….and gives all the details in his upcoming biography “The Big Fight: My Life In and Out of the Ring”.

In the bio, Leonard explains the boxing coach “unzipped my pants and put his hand, then mouth, on an area that has haunted me for life.”

He continues: “I didn’t scream. I didn’t look at him. I just opened the door and ran.”

Since then….the coach has passed away, but Leonard never identifies exactly who it was.

Damn….who would have ever known????