Freshness of Balls for club players

GameSetAndMath

The GOAT
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1. Once I open a can of balls, how long I can typically use them without them going
really bad (losing their pop). I know in professional tournaments, they change balls every
9 games or so. But, here I am talking about intermediate club level players.

2. Once I buy a can of tennis balls, will they be good for however long as long
as the can remains unopened.