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A Type 3 Tennis Ball Mystery for When You’re High

As we were exploring the four types of balls approved for sanctioned tennis competition last week, I stumbled across a YouTube video containing screen shots from the 2012 version of the “ITF Guide to Products and Test Methods.” One of the pages depicted in that video illustrated notional bounce paths for three of the four types of approved tennis balls. That image also contained a note that the Type 3 tennis ball is also permitted and recommended for play at High Altitude. It is a complete mystery why the ITF would make that recommendation.