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One reason could be because the ball has gotten wet from sweat, ground condensation, etc. Another reason could be because the ball has cut or gashes in it. The most common reason is to speed the game along, especially on past balls!

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โˆ™ 2006-08-20 18:45:03
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Q: Why do umpires change baseballs often after every pitch nowadays since they used to keep balls in play for much longer?
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