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Relevant Tennis on Twitter: "Hugo Dellien is the player with the lowest 1st serve average speed in 2022. Only 156kph (97mph). His first serve is slower than 37 other players' average second
A Second Serve That's Just as Big as the First - The New York Times
Pete Sampras and the Top 25 Servers in the History of Men's Tennis | News, Scores, Highlights, Stats, and Rumors | Bleacher Report