The fastest ever serve recorded; 251 Km/h, was by Ivo Karlovic.
Venus Williams holds the record with a serve of 204 km/h at the French Open in 2007
It is hard to determine what the average speed of a tennis serve is from various players, but Sam Qurrey is among the fastest serves of all time. He has recorded a serve of 141 miles per hour at multiple events.
The record for the fastest ace is held by Ivo Karlovic who served a 156 mph (~251 km/h).
163.4mph (263km/h). Recorded by Samuel Groth in Busan during an ATP Challenger match
Sabine Lisicki ---- 130 Mile/hr,,,,,,, (2009 commonwealth bank)
For the girls Venus Williams. 127 mph was the speed.
The fastest speed is 763.035mph
the fastest recorded speed was about 40 mph.
the fastest speed ever is 12874.97 mph