EXCLUSIVE

Dr. Oz hit a once-in-a-lifetime golf shot last week -- but it didn't hit the pin ... it hit an old guy in the arm!

According to our sources, Oz was golfing in Florida with his son, his father-in-law and another man. We're told Dr. Oz teed off at the third hole when a man in a golf cart came driving through from the fourth hole.

Wouldn't ya know it ... we're told Oz's shot hit the guy square on his right forearm. Our sources say Oz and his father-in-law, Dr. Gerald Lemole, went running over to the guy (who, we're told, was in his mid-seventies) to check on him.

According to our sources, Oz and Lemore tended to the guy until paramedics could arrive. We're told the guy was in a lot of pain, and his arm was badly bruised, but he ultimately did not go to the hospital.

If the guy sues, do you think Dr. Oz's malpractice insurance would cover it? Probably not ...

