Mühlberger, Alexander, and Otto Kolbinger. “The Serve Clock Reduced Rule Violations, But Did Not Speed up the Game: A Closer Look at the Inter-Point Time at the 2018 US Open”. Journal of Human Sport and Exercise 16, no. 3 (July 1, 2021): 528–540. Accessed March 29, 2024. https://www.jhse.ua.es/article/view/2021-v16-n3-serve-clock-rule-violations-speed-up-game-2018-us-op.