How durable are tennis balls?

Answer 1

This all depends on how good a player is, how hard the ball is hit, etc. However, if they get wet they get ruined. If you don't play much they last a long time. On average, an average hard court tennis ball will last 1-2 weeks, before starting to show signs of wear, if used for an hour a day. However, the life span will decrease for example if the ball is used for a few hours a day.