Who has hit the fastest serve in tennis history? The answer to that question may seem straightforward but it isn’t.

For example if you Google "fastest serve of all time" you get different answers. Most of them say Australian Sam Groth has the fastest serve ever and Guiness World Record, but there are many articles saying American John Isner has hit the fastest serve.

So who holds the record and why isn’t Groth’s and many others serves recognized by ATP? Let's find out!

Music by Karl Casey @ White Bat Audio

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