163.4mph (263km/h). Recorded by Samuel Groth in Busan during an ATP Challenger match
The fastest speed is 763.035mph
the fastest recorded speed was about 40 mph.
The record for the fastest ace is held by Ivo Karlovic who served a 156 mph (~251 km/h).
Andy Roddick 153 mph June 11 2004
the fastest speed ever is 12874.97 mph
The fastest typing speed was by a women maintaining a speed of 212 wpm.
My highest speed is 26.4
The fastest tsunami speed recorded is 800 [eight hundred] miles per hour