US Open shot clock: What is it? Is there a punishment? What does Rafael Nadal think?

THIS year's US Open has seen the introduction of a shot clock for the first time and Express Sport brings you everything you need to know about the controversial policy.

from Daily Express :: Tennis Feed https://www.express.co.uk/sport/tennis/1012599/US-Open-shot-clock-Rafael-Nadal-Novak-Djokovic-Roger-Federer-code-violation
via Express