The International Tennis Federation (ITF) does not have a standard for the shape or size of the "squares" or "mesh" of a tennis net. The only rule is: ". . . it must be of sufficiently small mesh to ensure that a ball cannot pass through it." Since a tennis ball's minimum width is approximately 2-1/2" wide, the width of the "square" must be smaller than that. Refer to the ITF links, below, for further information.
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