Their two wingers terrorized Auckland fullbacks Takuya Iwata and Daewook Kim, with Iwata in particular struggling with the pace of Yoshifumi Kashiwa.
Last year Auckland City went more than 250 minutes without conceding a goal in Morocco, which was the critical factor in their eventual success. Last night it was only nine minutes before the dam burst, as Kashiwa - who was a menace all night - cut inside and unleashed a shot from 25 yards out. In the greasy conditions Spoonley had two choices - a clean catch or a strong punch.
However he did neither and the ball fell to Yusuke Minagawa, who tapped in from three yards.
The Cameroon officials were also caught out, as it looked like at least two of the Hiroshima attackers were offside as the shot came in. The goal changed the game, as until then the ASB Premiership side had been holding their own. Auckland City continued to dominate possession - with Micah Leaalafa looking particularly dangerous - but couldn't force any clear opportunities.
Leaalafa was brought down on the edge of the area - perilously close to a penalty - but the visitors found no profit from the free kick. That was a disappointing aspect of the match; Auckland City had several set piece opportunities but the delivery wasn't of the quality required at this level.
In the second half Auckland City were walking the tightrope; they had to push forward and create more opportunities, but couldn't afford to leave the door ajar for Hiroshima at the back. Spoonley redeemed himself somewhat with two fine saves but the curse of goal keeping means you can't afford even a single mistake and the deflected shot for the second goal - which Tsukasa Shiotani squeezed under his body - will be an unfortunate memory.
Sanfrecce Hiroshima 2 (Y Minagawa, T Shiotani)
Auckland City 0
Halftime: 1-0