Guys felt this hit around the planet.

For some reason the Ball Boys stand with their hands behind their back. It might be awhile before this kid can do this job without flinching. Feliciano Lopez hit a serve 196 km/h, which is just over 121mph. The ball was called out, but it did hit something. I have a friend who played collegiate tennis, and was recognized for his big serve, tell me that the speed drops by about half once it bounces, but still...OUCH!