Many players can put good spin on their serves, but it is obvious to anyone watching what type of spin is on the serve. There are many ways of hiding the spin, but here’s a simple one: the instant after contact, change the direction of the racket, and exaggerate the follow-through but in the "wrong" direction. So if you are serving topspin, you might use an exaggerated downward follow-through to make it look like you served backspin. You might also try following through to the side to disguise backspin or topspin. Remember the hand is quicker than the eye, and serving is the "trick" part of table tennis.
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