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I notice if the ballboy/girl is on the left they always crouch, and if they are on the right they always stand. Why?
Because the side they stand on is next to the Referee's stand and the ballkids blend into the shape of the stand. Whereas, on the side the crouch, they do it to minimize peripheal distractions to the players.
The ball boys or girls crunch to reduce distraction to the players. If they stand, they have to blend into the referees stand.
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