Ball changes without the new-ball myths.

How to know when new balls are due

1. Start with the competition's announced ball policy, because the Rules of Tennis require organisers to state the number of balls and any change schedule.
2. Check whether the policy changes balls after a fixed odd number of games or at the beginning of each set.
3. If the policy uses a game count, count completed games, not points or minutes.
4. Remember that the first scheduled change is two games earlier than the later changes when the match balls were used for the warm-up.
5. If the count lands at the start of a tiebreak, delay the change until the beginning of the second game of the next set.

The schedule is announced before the event

The Rules of Tennis do not force every match to use the same new-ball pattern. Event organisers must announce how many balls are in play, such as two, three, four, or six, and whether there is a ball-change policy. Once that policy is announced, officials apply it as part of match administration.

Why the first change can come early

When balls are changed after a set number of games, the first change is made two games earlier than the later cycle. That is because the balls used at the start of the match have usually already been used during the warm-up. The rule treats that warm-up wear as roughly equivalent to two games.

New balls do not start a tiebreak

A tiebreak counts as one game for ball-change counting, but a ball change is not made at the beginning of a tiebreak. If the scheduled change would fall there, officials delay it until the beginning of the second game of the next set. This avoids giving one player or team the first point of a tiebreak with a fresh-ball serving advantage.

Some policies change balls by set instead

An event may also use a policy that changes balls at the beginning of a set. In that format, the new-ball timing follows the set break rather than an odd-game cycle. The practical question is still the same: what ball policy did the event announce before the match?

If a ball breaks during the point

If a ball breaks during play, the point is replayed. That is different from a player simply disliking the bounce or noticing wear after the point. A broken ball affects the live rally itself, so the rules treat the point as unreliable and start it again.

A soft ball does not undo the last point

If a ball is found to be soft at the end of a point but it is not broken, the completed point stands. Officials may remove an unfit ball from use, but the previous rally is not replayed just because the ball has lost pressure or feels dead after the point is over.

What people often get wrong

• "New balls after seven and nine is the rule everywhere" is too broad. That pattern is familiar in many professional settings, but the event's announced policy is what matters.
• "A tiebreak is ignored for ball changes" is not quite right. It counts as one game, but the change is delayed if it would otherwise begin the tiebreak.
• "A bad bounce means a replay" is usually wrong. The rule distinguishes a ball that breaks during play from a merely soft or worn ball noticed afterward.
• "Players can demand new balls whenever they want" is wrong. Players may raise a concern, but officials administer the schedule and decide whether a ball is unfit.

How officials enforce the change

Chair umpires and ball crews track the game count and prepare the correct balls before the change is due. The umpire may announce new balls so both players know the next game will play differently. If a ball is lost, damaged, or questioned between scheduled changes, officials try to keep the set of balls consistent with the wear level required by the match procedure.

Why players care about the timing

Fresh balls usually fly faster, bounce more lively, and reward clean serving and first-strike tennis. Older balls can feel heavier and slower as their felt fluffs up and pressure drops. That tactical difference is why players pay attention to whether they are serving with new balls, but it does not change the scoring rules for the game itself.

Source material

• ITF Rules and Regulations
• ITF Rules of Tennis
• ATP Official Rulebook
• WTA Rules
• USTA Friend at Court