Who has the fastest serve in tennis history?

[lucasmitchell]

I heard that Sam Groth recorded one of the fastest serves ever at about 263 km/h during a professional match. That speed is unbelievable in tennis. Do you think anyone will break this record soon?

 

[benjaminhayes]

The record for the fastest serve in tennis history is held by Sam Groth, who blasted a serve at an astonishing 263.4 km/h (163.7 mph) during the 2012 Busan Open Challenger Tennis. However, when it comes to official ATP matches, the title goes to John Isner, who served at a speed of 253 km/h (157.2 mph) in 2016.