WATCH: Ben Shelton Unleashes 158 MPH Serve Against Frances Tiafoe At US Open 2026 Semifinals, Fastest Grand Slam Service Ever

Ben Shelton brought the heat, literally, during his all-American US Open 2026 semifinal against Frances Tiafoe, which is in progress at the time of writing, unleashing a stunning 158 mph serve that left the Arthur Ashe Stadium crowd roaring. This is the fastest Grand Slam service of all time, surpassing record of 153 mph (246.2 km/h), hit by French player Giovanni Mpetshi Perricard in 2025 Wimbledon. 

Ben Shelton vs Frances Tiafoe LIVE Update From US Open 2026 Semifinals

The American eighth seed has been relying heavily on his biggest weapon throughout the match, and the huge delivery came as Shelton and Tiafoe continued to trade momentum in a gripping semifinal. Shelton had already produced a 149 mph ace in the second set, before taking his serving power to another level with the 158 mph rocket.

158 MPH FROM BEN SHELTON 💨 pic.twitter.com/kHPV9KnSKA

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— US Open Tennis (@usopen) September 12, 2026

The match was finely poised after the opening two sets. Tiafoe took the first 6-4, using aggressive returning and pressure at crucial moments to break Shelton’s serve. Shelton responded in the second, finding his range behind the first serve and taking the set 6-3.

Shelton Takes Lead In 3rd Set With Cross-Court Winner 

Ben gets a big break!

A cross-court winner gives him in advantage in the third. pic.twitter.com/iPB6Ke4QNx

— US Open Tennis (@usopen) September 12, 2026

The third set has been just as competitive. Tiafoe initially moved ahead, but Shelton fought back and broke to take a 3-2 lead, with the American pair continuing to produce long, physical exchanges. The latest live score has Shelton serving at 3-2, with the third set still in progress.

“Farmeó Aura” – Luis Alfredo Alvarez, 2026 😂 pic.twitter.com/kBavmwTxSO

— US Open Tennis (@usopen) September 12, 2026

Shelton’s serving numbers underline just how important the weapon has been. He has already fired 10 aces, compared with Tiafoe’s one, while landing 76% of his first serves. Tiafoe, however, has been more effective when he gets into return points, winning 33% of Shelton’s service points.

Now, with a place in the US Open final at stake, Shelton is trying to use that same weapon to keep Tiafoe under pressure.