The unusual situation in which the sport finds itself has given birth to some new sports heroes.
These days they are 13-year-old Vitoria and 11-year-old Carola from the Italian province of Liguria.
These two girls became a hit on the Internet after they posted a video of them playing tennis on the roofs of the buildings where they live.
This clip has over eight million views on social networks.
Bonus video:
