Four coronavirus cases have been detected from charter flights carrying tennis players, coaches and officials to Melbourne for the Australian Open, forcing 47 players into strict hotel quarantine.,However, the players from the two affected flights — arriving from Los Angeles and Abu Dhabi — were in a strict 14-day quarantine, unable to leave their hotel rooms or practice, health authorities and tournament organizers said Saturday.,Health authorities initially said two positive COVID-19 cases — a coach and a member of the air crew — emerged from a charter flight from Los Angeles and the other positive test was a coach on the flight from Abu Dhabi.,On Sunday, Victoria state’s COVID-19 quarantine commissioner Emma Cassar told a news conference another positive test, from a member of a television broadcast team, had been returned off Los Angeles flight.,Tennis Australia confirmed there were 24 players on the flight from Los Angeles and 23 on the flight from Abu Dhabi.