Originally Posted by cluckcluck
Couldn't have said it better, especially hardcourt tournaments are terribly slow which makes it hard for tall (+6'2") big hitter to hit through the court. I'm also surprised that the taller players aren't hitting BOMBS on serve all the time. Isner served an average first serve of mid 120's. I would expect averaging mid 130's with that height.
That's because they don't hit flat all the time. Taller people hit spinny serves outwide a lot, and that bring down their average serve speed.
If there was a stat for average 1st serve speed for flat serves, yes, Isner would be well over 130.