The U.S. Open has a 'Rona problem and a Drone-a problem -- meaning there's concern about unmannned aircrafts infiltrating the tennis tournament ... and the NYPD is on the case.
With the U.S. Open set to go down in New York on Aug. 31, organizers have already said no fans will be allowed to attend the event due to the COVID-19 pandemic.
Sources tell TMZ Sports ... law enforcement is now anticipating an uptick in drone activity around Flushing Meadows from both journalists and fans trying to get a bird's-eye shot of the action.
We're told .