Richie Incognito SMASHED HIS OWN FERRARI with a baseball bat ... at least, that's what he told police this morning ... TMZ Sports has learned.
We broke the story ... neighbor's noticed someone had taken a bat to the front of the Richie's black Ferrari in front of his home in AZ yesterday.
Now, the Scottsdale Police Department tells us ... they spoke with Richie early this morning and he admitted he took the bat to his own car.
Clearly, Incognito was pissed about something ... but we don't know what set him off.
We reached out to Richie's people for comment -- so far, no word back.