920 | March 26, 2023 | Nick | This rule should remain unchanged. The court is a 2 dimensional area. This is in line with the non-volley zone rules which allow use of the space above the nvz.
as long as the surface is not contacted. For referees, it is relatively easy to determine if a foot touches the area outside the side/center line, but adding the foot in the air must also be observed complicates the refs job.
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