Every Wednesday, this site examines a rule or governing principle that shapes how tennis is actually played. We are currently in the midst of a sequential walkthrough of The Code, exploring one principle at a time as it appears within the USTA’s Friend at Court. Over the past three weeks, we have dissected Principle 12, which codifies the disposition when an incorrect call is reversed, explored why the point is awarded rather than replayed, and considered the lone exception involving let serves. This week, we conclude our discussion of that principle by examining how it has evolved over the past 25 years.
The current version of Principle 12 reads as follows:
Out calls reversed. A player who calls a ball out must reverse the call if the player becomes uncertain or realizes that the ball was good. The point goes to the opponent and is not replayed. However, when a receiver reverses a fault call on a serve that hit the net, the server is entitled to two serves.
USTA Friend at Court 2026 , The Code, Principle 12
Out calls reversed. A player who calls a ball out must reverse the call if they become uncertain or realize the ball was good. The point goes to the opponent and is not replayed. However, when a receiver reverses a fault call on a serve that hit the net, the server is entitled to two serves.
The 2001 edition of Friend at Court is completely different:
Out calls corrected. If a player mistakenly calls a ball “out” and then realizes it was good, the point shall be replayed if the player returned the ball within the proper court. However, if the player’s return results in a weak sitter, the opponent may claim the point. If the player missed the return, the opponent wins the point. If the mistake was made on the second serve, the server is entitled to two serves.
USTA Friend at Court 2001 , The Code, Principle 12
Of all the principles in The Code we have examined up to this point, this updated wording represents a dramatic shift in the underlying philosophy.
The 2001 version of Principle 12 attempted to reconstruct what might have happened had the incorrect call never occurred. Did the return land in? Was it a weak sitter giving the opponent an easy put-away? Each answer led to a different remedy. The rule sought to tailor the outcome to the specific circumstances at the point of interruption.
The current Principle 12 abandons that approach almost entirely. Rather than trying to recreate a rally that can never actually be replayed, it asks a much more fundamental question. Was the ball good? If the answer is yes, the point belongs to the opponent.
The result is a rule that is both easier to understand and easier to apply. More importantly, it eliminates the subjective judgments that the earlier version required players to make. Determining whether a return was a weak sitter or whether an opponent would have won the point anyway often invites as much disagreement as the original line call itself.
What strikes me most is that the underlying goal has not changed. Both versions seek an equitable resolution. However, the solution each pursues is dramatically different. The 2001 version sought to maximize fairness on a single disputed point by crafting a remedy tailored to the unique circumstances. The current version seeks fairness across every point by giving players a rule that is objective, consistent, and easy to administer. It accepts that a simple rule applied consistently will often produce better outcomes than a complicated one requiring multiple subjective judgments.
The updates to Principle 12 reveal a philosophical shift that the previous 11 principles we have examined up to this point did not contain. The changes are not merely editorial. Rather, they reflect an evolution from resolving individual disputes to designing a solution that all players can consistently apply.
For me, this has been one of the most interesting discoveries of this entire walkthrough. Up until now, the revisions to The Code have been remarkably consistent, peppered with only subtle hints of change. This is the first time there is clear evidence that the game’s behavioral standards have significantly evolved.
- Friend at Court: The Handbook of Tennis Rules and Regulations, USTA, 2026
- Friend at Court: The USTA Handbook of Tennis Rules and Regulations, USTA, 2001. (Hardcopy.)
