Depending on the player. Some sweat alot, especially in countries with high humidity. Sweat rolling down from the arms may get into the grip too.
Not sure what’s the percentage but the wooden handle definitely will absorb the sweat from the wet grips. Wood and water don’t go well.
I don’t have data to back me up but I did change grip on site after a game and u can see part of the wooden handle is moist.
But I’ve always removed factory grips right from getting the racket as I prefer a smaller grip. However before putting the sponge wrap, I have a cling film wrapping the handle, then sponge layer then over grip. I use sponge wrap to adjust the grip size I want.
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