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Why the tennis “serve clock” may be a waste of time - Kovalchik - 2018 - Significance - Wiley Online Library
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Shot clock, warm-up clock to be implemented at 2018 US Open - Official Site of the 2022 US Open Tennis Championships - A USTA Event
U.S. Open will use a 25-second serve clock to speed up pace of play - The Washington Post
Love It or Hate It, There's No Ignoring Tennis's New Serve Clock - The New York Times
Australian Open 2020: Shot clock rules explained as Novak Djokovic blasts umpire | Tennis | Sport | Express.co.uk
Tennis Players Get Ready to Be Put on the Clock (Visibly) - The New York Times
Body clock, countdowns, net-dribble serves among ideas for tennis' future | Sports News,The Indian Express
Rules of the Tennis Serve: An Exhaustive Guide – Racket Sports World
New rules wrinkles ready for US Open – Open Court
Tennis Serving Rules: How To Serve Properly (With Pictures)
USTA discusses serve-clocks and eliminating service lets to improve tennis | Tennis | The Guardian
