After receiving a message from Greg Thorner, a golf instructor in New England, it appears that Thorner's friend - another golfer that's named Tommy Fleetwood - had actually received the 29-year-old Englishman's payout from his excellent performance at Carnoustie.
Golf Digest have confirmed that this situation, is, in fact, true and to his enormous credit, Fleetwood is laughing the whole thing off.
The problem: It went to the wrong Tommy Fleetwood.
"My friend Tommy is a good guy and would always pay it back". He is in his 50s now and trying to make it on the Seniors circuits, but I think what happened was that he played some Challenge Tour events on the European Tour back in the day and they must still have his details on file.
The elder Fleetwood is now reportedly in the process of returning the money to the World No. 11 Fleetwood, but at least he can now probably say he's received more money as a pro than any of his colleagues.
"It was an honest mistake", Fleetwood said, sounding dumbfounded that he had suddenly become a focus of media attention.
Fleetwood, who begins his PGA Championship bid at Bellerive on Thursday, said: "It looks pretty genuine". "The European Tour are looking into it and I'm sure they'll feel pretty bad about it".
'It's a amusing story.
"It was only for $14 or something but he called it up and looked at his statement, and that's when he shouted 'Holy smoke, I've just had US$154,000 paid into my account!'"
Hs is now preparing to play at this week's USPGA Championship at Bellerive in Missouri.
Fleetwood has four European Tour titles to his name, and finished second at the US Open in June.