SAO PAULO (AP) — The biggest question for Thursday’s opening match of the World Cup isn’t whether host Brazil can beat Croatia but how the unfinished and troublesome Itaquerao stadium will hold up in its first ever encounter with a full-capacity crowd.

Will everything work? More importantly, will the 61,600 spectators be safe? Not even World Cup organizers can be totally sure. Because of chronic delays, worker deaths and other problems during its construction, the new arena has never been match-tested at close to full capacity.