Over time, the pressurized air leaks out of tennis balls, making them unsuitable for play. There are a couple ways to tell if a tennis ball is too old to be used for your tennis game. Hold an old tennis ball at the same height as a new one and compare how high both of them bounce.
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The Short Answer: Playing at a recreational level, a can of pressurised tennis balls will last anywhere between 1-4 weeks of light to moderate play. If used for competitive tennis, a pressurised set of tennis balls might last as little as 1-3 hours. Pressureless tennis balls can last 1 year and maybe even longer.The tennis balls in Grand Slams, ATP and WTA tournaments are changed after seven games and after every nine games thereafter. There are six balls in play in these events.
Can you refill a tennis ball
Most soft tennis balls will collapse at pressures above 25 psi, so there is no point using a tennis ball pressurizer any higher than that level. We recommend 20 psi for reviving soft tennis balls, and 14 psi for maintaining perfect bounce. Not all balls can be revived, but the vast majority can be.
