<P> Although the Association of Tennis Professionals does not formally recognise 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 . However , John Isner holds the official record for the fastest serve at 253 km / h ( 157.2 mph ) . </P>
<P> Although the Association of Tennis Professionals does not formally recognise 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 . However , John Isner holds the official record for the fastest serve at 253 km / h ( 157.2 mph ) . </P>
who has the fastest serve in the atp tennis history at 163.4 mph
who has the fastest serve in the atp tennis history at 163.4 mph
Sam Groth
Sam Groth