what is the fastest serve in tennis

The fastest tennis serve ever recorded was hit by Australian player Sam Groth in Busan, South Korea in 2012, clocking in at a whopping 263.4 km/h or 163.7 mph. However, the ATP (Association of Tennis Professionals) does not officially recognize it as the fastest serve due to a lack of uniformity in the calibration of the serve speed tracking equipment. As such, American John Isner holds the ATP’s official record for the fastest serve at 253 km/h or 157.2 mph hit during the 2016 Davis Cup. The fastest female tennis serve ever recorded was hit by Spanish player Georgina Garcia Perez in 2018, clocking in at 220 km/h or 136.7 mph.