How my racket head speed correlates with pro's racket head speeds. If there a listing of average or, say, Fedalovic's racket head speed for the basic shots? I am wondering, because I have been hitting around w/Zepp sensor and the Sony. Getting racket head speeds which are consistent across platforms and am just curious as to what it really means. I mean, I know that I can compare me to me and see how I change... but what does it mean in the greater scheme. Would love to see: Serve Forehand Backhand avg swing speeds. Thanks!