The person who holds the best record in Tennis for the fastest serve ever is Sam Groth from Australia at 163.7 MPH (263.4 KM/H). History was made at the Busan Open 2012 Challenger Event.

The runner up is John Isner who hold’s a fast serve at 157.2 MPH (253 KM/H).

It’s only a matter of time for the next person to come along and break that record. Until then, congrats to Sam Groth.