The COVID-19 Tangent
There are no rules specific to the control of infectious disease in the 2020 ITF Rules of Tennis. The same can be said for the USTA Friend at Court. That is not a surprise because when both of those publications were released last year, COVID-19 was not yet a major concern. As a result, COVID-19 has the distinction of being the first content on this site that was completely unrelated to the ITF Rules of Tennis.