NEW YORK, NEW YORK - SEPTEMBER 11: A detailed view of the sever speed board with a 158 MPH serve by Ben Shelton of the United States is seen during his Men's Semifinal match against Frances Tiafoe of the United States on Day Thirteen of the 2026 US Open at USTA Billie Jean King National Tennis Center on September 11, 2026 in the Flushing neighborhood of the Queens borough of New York City. (Photo by Julian Finney/Getty Images)