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Old 08-21-2019, 09:50 AM
zimaane is offline
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Join Date: Jan 2003
Location: washington, dc
Posts: 997
A nice bright clean ball is easier for the batter to see, and pick up the rotation on.

There is also a safety aspect - a really dirty ball would be hard for a batter to see, and if it were coming towards his head, he might not get out of the way in time.