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John Isner Serve High Resolution Stock Photography and Images - Alamy
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New York, United States. 04th Sep, 2018. John Isner of USA serves during US Open 2018 quarterfinal match against Juan Martin del Potro of Argentina at USTA Billie Jean King National Tennis
John Isner Serve Speed, How Fast Does John Isner Serve? » FirstSportz
Roger Federer Solves John Isner's Serve, Finally, and Advances - The New York Times
Wimbledon 2015: John Isner serve speed, aces - Sports Illustrated
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Australian Open 2020: Nick Kyrgios 252 km/h serve, fastest tennis serves ever, Kyrgios serve speed, speed gun was wrong
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