What if my opponent and I disagree on the score or a call in a match with no official?

Tennis Canada's Guidelines for Unofficiated Matches (Rules of the Court 2026) say:

• Score disputes: in this order, (1) count the points and games you agree on and replay only the disputed ones, (2) play from a score you both agree on, (3) spin a racquet or toss a coin. Do not spend a long time debating.
• Questioning a call: ask yourself whether you clearly saw the ball land in the court, then ask "Are you sure of your call?". If your opponent says they are uncertain, they lose the point. If they confirm, the call stands and there is no further discussion.
• Asking for help: if you ask your opponent's opinion on a call and get a positive opinion, you must accept it. If neither of you has an opinion, the ball is good. Help is available only on a call that ends a point.
• Calling your own mistake: if you call a ball out and realize it was good, the first time the point is replayed unless it was a point-ending shot (then your opponent wins the point). After that, any other incorrect call loses you the point.
• Prompt calls: make calls promptly, before your return has gone out of play or your opponent has played the return.
• Points played in good faith stand, for example if you find the net was too high only after losing a point.
• Disagreements should not disrupt other courts. Patterns of problem behaviour should be raised with an official or tournament director if present.