The ATP Tour Finals at the O2 in London is due to be played behind closed doors in November.
The season-ending tournament, which features the best eight singles players and doubles teams of the year, will be played between November 15 and 22.
However, in what is its last outing in London before heading to Turin in 2021, there will be no fans inside the area unless current guidance from the government changes.
The tournament has been staged at the O2 since 2009 but is moving to Italy from 2021-2025 and Novak Djokovic, Rafael Nadal and Dominic Thiem have already qualified for this year's event.
The ATP has also announced a revised calendar for the rest of the season following a five-month suspension due to coronavirus, which sees the Asian-swing scrapped.
The Tour resumes on August 22 with the Western & Southern Open in New York followed by the US Open at the same venue.
A shortened clay-court swing follows, culminating in the French Open on September 27, before a five-week indoor European stint.
