For every tennis match there maybe 60 balls needed
92 times a day
Usually there is about 3balls in an average can of tennis balls. Although you casn get packages of tennis balls with 18 or higher. Also comes in many shapes and sizes.
The Stars' Tennis Balls has 388 pages.
4 Wimbledon French Open US Open Australian Open
It really depends on where you live and what time you buy them. During the US Open, Wal-Marts in many areas carry Wilson tennis balls (because Wilson sponsors the US Open with their tennis balls). Penn tennis balls can be found at Wal-Mart, but once again, it's all about the location. Some stores have it and others don't.
Look at the picture.
No tennis balls are not toxic. Many people may think they are but that is not true.
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