As a girl's coach, I always try to check the ball they intend to use so that we don't have this issue. And I always have a good quality game ball ready when they don't have one. But then again, we play some leagues where a boy's game frequently precedes a girl's game, and you always want to have the right ball on the court.
And since I mainly handle the 285, I immediately notice the difference when I pick up the men's ball. It is distinctly heavier and sits in the hand differently. But I can see that if you are always using the men's size, you would think nothing of tossing it up at the start of a girl's game. But any good girl's player will note the difference immediately.
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