158 mph?! Hawk-Eye throws cold water on Ben Shelton’s apparent record serve at US Open

Ben Shelton is known for his lightning-fast serve — just maybe not that fast.

During the third set of the 23-year-old’s thrilling US Open semifinal victory over fellow American Frances Tiafoe, Shelton appeared to record a eyebrow-raising, 158 mile-per-hour serve, according to the measurement displayed in the stadium.

It was, certainly very fast: Tiafoe was barely able to get his racket on the potentially record-breaking serve, sending the return out of bounds as a result of the rapid speed.

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However, 158 mph immediately felt a little bit too high, even for