Sweaty Feet !
Sweaty feet indicate moisture. Moisture on a 100-mph fastball usually evaporates very quickly, unless it is oil-based. More evaporation underneath a baseball cools the air beneath it. This adds to the LIFTING coefficient of the RISING fastball! However if the pitcher throws a wet sinker or a wet cutter, then it adds to the sink or the cut, not to the LIFT.
Yeast, algae or other foreign substances impy ITCHING which may require scratching the baseball to provide more "roughness" on the surface of the baseball. This also adds to the LIFTING/sinking or cutting motion at sea-level; and not so much a mile higher.
Baseball players are most well-known for SPITTING and SCRATCHING. More team players spit and scratch than any other athletic sport (JMOHO). I'm sure you disagree just because I wrote it just to disagree with ME here, AGAIN.
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