[1] The fastest recorded serve at an ATP event was by John Isner, at 253.0 km/h (157.0 mph) in the first round of the 2016 Davis Cup.
For instance, not listed here, Roscoe Tanner's serve was recorded at 246.2 km/h(153 mph) at Palm Springs in 1978 during the final against Raúl Ramírez.
[5] This qualified him to take part in the finals at the West Side Tennis Club in Forest Hills Queens on 20 August 1976.
The Women's Tennis Association does have an external partner that it officially recognizes which measures and maintains serve speed data at selected number of events.
It does not recognize at all, nor keep tabs of speed records set outside the main draw phase of WTA Tour tournaments.