
Novak Djokovic is the latest tennis player to express his frustration with the implementation of the serve clock rule in tournaments this season.
Tennis players now have 25 seconds from three seconds after the previous point to serve the next point. The timer used to start after the umpire put in the score change, but the ATP Tour has been testing this new rule since June. It's confused many players this year since it began mid-season and apparently hasn't been well communicated or explained.