Hi Allyot, I’m not exactly sure what you’re asking here but if you mean what serves do the pro players like timo etc do then usually a wide variety. Mostly they will serve some variety of sidespin with either backspin or topspin to try and deceive the opponent. Ovcharov serves with a lot of sidespin and slightly longer to try to get a weak return to attack or counter topspin. Obviously service is quite an individual area of the game that works around your personal strengths, so experiment to see what works best for you!