3 Covid-19 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 on 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 cases from Los Angeles involved an aircrew member and a passenger who was not a player. The third positive test, also not a player, was from a flight from Abu Dhabi. The Australian Open is scheduled to start on February 8.