Three coronavirus cases have been detected among charter flights carrying tennis players, coaches and officials to Melbourne ahead of the Australian Open, health authorities and tournament organizers said Saturday.

A total of 47 players from the two affected flights — arriving from Los Angeles and Abu Dhabi — are now in a strictly enforced 14-day quarantine without the ability to leave their hotel rooms — even to practice.

The Australian Open is scheduled to start Feb. 8.

Health authorities said two positive COVID-19 cases emerged from a charter flight from Los Angeles, and later Saturday, Tennis Australia said there was a third positive case from a flight from Abu Dhabi.

The cases from Los Angeles involved an aircrew member and…