This article lists the fastest recorded tennis serves in the men's and women's games. This list may not be historically complete. A serve by Bill Tilden in 1931 was timed at 182.2 mph (293.3 km/h), but this is not listed because of questionable technological accuracy. There are also reports of Tilden’s serve that was clocked at 163.3 mph but there is nothing to verify that.
Though the Association of Tennis Professionals does not formally recognize service speed records made in Challenger events due to the variance in radar guns; the serve of 263.4 km/h (163.7 mph) recorded by Australian Sam Groth at an ATP Challenger event in Busan, South Korea in May 2012 was measured using approved equipment, and other data gathered appeared within a normal range. Technically however, John Isner still holds the official record for the fastest serve.
Ivo Karlović with 232 km/h (144 mph) second serve in quaterfinals of 2007 Legg Mason Tennis Classic in Washington holds the record for the fastest second serve ever recorded.