Why do some profesional baseball players lick their fingers before pithing the ball(only the pitcher)
They can grip the ball better, and they can also throw a curve ball.One other reason is, because they get dry dirt on their hands, and the ball like slips, and doesn't go the distance.Like pool players, their hands get sweaty so they rub chalk on their hands.
Back on the day they used to put bassoons on the inside rim of the cap to grease up the ball for good pitching... Illegal now.... You can also get in trouble for too much pit on your fingers...LOL
It has long been a baseball tradition that pitchers eat pickled eggs between innings to keep up their stamina. They usually lick their fingers because they are still a bit sticky and they don't want them to stick to the ball.