Originally Posted by rus59
first players that come to my mind are Becker and Harrison.
Used to be Becker had matches when his serve was just untouchable. He's improved his ground game, but I actually found him more impressive as a 5'11 servebot. His serve speed average was once
the 5th fastest in the game- behind Roddick, Dent, Raonic, and Isner (ahead of Karlovic!) and he would hit upper 130s or low 140s at least once a match