According to WTA Rules: "At all Tier levels for all matches in both Qualifying Singles and Main Draw Singles and Doubles, six (6) balls shall be used and changed after the 1st seven (7) games and thereafter every nine (9) games." If the match were to last 29 games (6-3, 4-6, 6-4), 24 balls would be used.
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usually in the team tennis we use three balls but when it is professionalls they get a new ball almost every point so it really depends on the score usually in the team tennis we use three balls but when it is professionalls they get a new ball almost every point so it really depends on the score
There is not a exact number of balls that are to be used. It can vary from 5 to 15+.