Professional golfer
In golf the distinction between amateurs and professionals is rigorously maintained. An amateur who breaches the rules of amateur status may lose his or her amateur status. A golfer who has lost his or her amateur status may not play in amateur competitions until amateur status has been reinstated; a professional may not play in amateur tournaments unless the Committee is notified, acknowledges and confirms the participation. It is very difficult for a professional to regain his or her amateur status; simply agreeing not to take payment for a particular tournament is not enough. A player must apply to the governing body of the sport to have amateur status reinstated.
Under the rules of golf and amateur status of the R&A, the maximum an amateur can win is £500. Under the rules of golf and amateur status of the USGA the maximum an amateur can win is $750. If an amateur accepts a prize of greater than this they forfeit their amateur status, and are therefore by definition a professional golfer.