Fastest serve of a tennis ball (male)
Samuel Groth
263 kilometre(s) per hour
Korea (South) (Busan)

On 9 May 2012, Samuel Groth (Australia) served an ace recorded at 263 km/h (163.4 mph) during an ATP Challenger event in Busan, South Korea. The serve came during Groth’s second-round match against Uladzimir Ignatik (Belarus). In the match, Groth also hit serves recorded at 255.7 km/h (158.9 mph) and 253.5 km/h (157.5 mph), both of which surpassed Ivo Karlovic's (Croatia) previous record of 251 km/h (156 mph). However, Groth still lost the match 6-4, 6-3.