One of the soundbites of Spurs' campaign has been Ange Postecoglou's quote in September that he always wins a trophy in his second season with a team - a claim that is mostly accurate.
But Spurs will have to improve - starting with actually creating some good chances - next week if he is to have a chance of continuing that run.
The Europa League is Spurs' last chance of silverware this season. Fail to win the second leg and they will probably not even be in Europe next season, given they are currently 13th in the Premier League.
AZ, who are sixth in the Dutch Eredivisie, were deserved victors and could have won by more.
Their biggest chance to score a goal themselves came when Troy Parrott, who left Spurs for £6.7m in the summer, was sent through on goal but denied by the foot of Vicario.
Lucas Bergvall was unfortunate to score the own goal when Parrott played a ball across and the Tottenham midfielder badly sliced his clearance which Djed Spence was unable to head off the line.
Spurs' only registered shot on target was probably not even a shot - with Wilson Odobert's cross palmed away.