Groth recorded the faster recorded serve on the ATP at 163.4 MPH.
The previous record was hit by Ivo Karlovic at 156 MPH.
Groth, ranked #340, broke that record 3 times in this match.
A match he lost pretty handily - 4 & 3 - at the Busan, South Korea Challenger.
The ATP doesn't actually keep official ace speed records...
Owing to the array of equipment used at each tournament.
But still. Wow.
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