What are the odds that a fan attending the upcoming Tokyo Games will be found to have been infected with the novel coronavirus?

They could be as low as one in a million, if data from Japan’s top professional sports leagues is any indication — offering hope to Olympic organizers faced with the monumental task of delivering the world’s biggest sporting event in the pandemic era.

With officials on Saturday announcing a ban on overseas attendees — a first in the event’s history — and local media reports suggesting that venues could be restricted to 50% capacity to allow for physical distancing, attention will now turn to whether local fans allowed to attend the Olympics will be at risk of infection.