Become A Rules Guru (No.9) Substitution of Ball
Saturday 8th December 2018
Rules of Golf 2019
Under Rule 14.3, when taking relief, the player will always be allowed the choice of substituting a ball or using the original ball, including:
When taking penalty relief as well as when taking free relief (Rules 15-19), and
Any other time the player is required to drop and play a ball, such as when returning to play from where a previous stroke was made after the stroke is cancelled.
You can read more and see video here