Davis937
Professional
Based on your experience (or you can speak from your own personal perspective), what kind of FIRST serve do most 4.0 players use (flat, slice, topspin / slice, etc)? What would you estimate is their first serve speed? What kind of SECOND serve do they use (kicker, slice, topspin, etc.). Again, what is the estimated speed of their second serve? Finally, what do you feel is the primary difference between the serve of a 4.0 player compared to the serve of a 4.5 player? Thank you in advance for your responses / comments.