It may come as a surprise to some golfers that the Rules do not require them to notify their marker or fellow competitor nor when they are substituting a ball under the Rules during play of the hole .
Fellow competitor ball they are playing before starting a hole .
It may come as a surprise to some golfers that the Rules do not require them to notify their marker or fellow competitor , which ball they are playing before starting a hole , nor when they are substituting a ball under the Rules during play of the hole .