ATP Cup organisers were left red-faced on Friday by playing the wrong national anthem for a player from Moldova, a small landlocked country in eastern Europe.
The embarrassing gaffe occurred ahead of the opening singles tie in Sydney of the heavily-promoted new team event as Moldova's Alexander Cozbinov faced Belgium's Steve Darcis.
Tournament officials told AFP the Romanian anthem was played instead.
"At the start of the Moldova v Belgium match we mistakenly played the wrong national anthem for Moldova," the ATP admitted.
"We are sincerely sorry and have apologised personally to Team Moldova."
"Moldova and Romania have the same flag so probably that's why they made a mistake. Hopefully next time it's going to be the right one."