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. This week, we move to Principle 12, which addresses one of the most psychologically difficult responsibilities in self-officiated tennis: changing your own call.
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
At first glance, Principle 12 appears to be about reversing line calls. I think it is actually about something much more fundamental. It is about recognizing that our first reflex is not always our most accurate one.
The wording is likely intentional. A player must reverse the call if they “become uncertain” or “realize” that the ball was good. Our eyes may anticipate the bounce based on the trajectory before it actually lands. Confidence that existed for a split second can suddenly evaporate. The Code recognizes that possibility and tells players exactly what to do when it occurs. Specifically, reverse the call.
I contend that this may be one of the hardest things to do in all of tennis. It is difficult enough to realize that you were wrong. It is even harder to publicly acknowledge that mistake by reversing a call that everyone on the court has already heard.
Personally, I rarely reverse one of my own calls. I would like to believe this is partly because I tend to err on the generous side in close calls. At the same time, I also recognize that nearly every player believes their own calls are accurate and fair. Anyone who has spent much time around recreational tennis knows that this confidence is not always justified. The fact that I seldom reverse a call does not necessarily prove that I seldom make mistakes.
In my experience, it is also quite rare to see anybody reverse one of their own calls. It certainly happens, but not often. Reversals occur somewhat more frequently in doubles than in singles because a partner can quietly become the catalyst for doubt. A brief conversation between teammates often feels collaborative rather than confrontational.
That brings me to what may be the most grating phrase from an opponent in all of recreational tennis. “Are you sure?”
In meaningful self-officiated matches, I have found that those three words almost never accomplish what the speaker intends. Rather than encouraging thoughtful reflection, they usually put the other player on the defensive. Once a call has been publicly challenged, the conversation often shifts away from determining what actually happened and toward defending a position that has already been taken.
Reversals rarely happen because an opponent challenged the call. More often, they arise from an internal reassessment. A player suddenly realizes the ball may have clipped the line, or their initial confidence begins to fade as they replay the bounce in their mind. Those situations reflect an honest reevaluation rather than a reaction to external pressure.
That distinction matters because Principle 12 is not really about persuading someone else to change their mind. It is about giving players permission to change their own. There should be no embarrassment in that.
In fact, reversing a call may be one of the strongest indicators that a player is genuinely trying to officiate fairly rather than simply defend a position. The willingness to acknowledge uncertainty, even after making a public decision, is not a sign of weakness. It is evidence that the self-officiating process is working exactly as The Code intended.
Next week, we will examine the second half of Principle 12 and explore why reversing an incorrect out call awards the point to the opponent rather than simply replaying it. It is yet another instance of The Code demonstrating a strong bias toward definitive outcomes over negotiated compromise.
- 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.)
