The build-up for next month's Australian Open suffered a jolt after three coronavirus infections were reported on a flight to the year's first grand slam.
Forty-seven players will now be forced into two weeks of hotel quarantine in Melbourne.
Organizers say the players will not be able to leave their hotel rooms for 14 days and until they are medically cleared.
That means they won't be able to practice ahead of the tournament.
The decision will translate into unequal preparation for the participants.
Uruguayan Pablo Cuevas took to Twitter to express his feelings.
Saying he'll go from five hours of training in a bubble to being stuck in his room.
Scottish former world number one Andy Murray revealed he tested positive for COVID-19 last week.
But said he was in good health and still hoped to compete.
American Madison Keys pulled out last week after she tested positive.
Australia has agreed to accept about 1,200 players, officials and staff on 15 flights for the major sporting event that is due to begin next month.