The weather unsettled a number of drivers as yesterday morning's race was the first held in the wet so far in the championship. Four cars failed to finish.
Maisano showed the experience garnered in a similar formula in Europe to take the win from American Santino Ferrucci and Dane Mathis Kristensen.
"It was very difficult in the race because the conditions were very bad and there was a lot of water on the track," said Maisano. "I used my experience to get a good start and after that it was easy to lead the race and I didn't push too much to make a mistake. It's also a lot of good points for me in the championship."
There was a dry line for the feature race and pole-sitter Sam MacLeod took advantage of his front row start to lead the chasing pack into turn one and was never really challenged over the ensuing 20 laps.
The damp track proved treacherous for those who ventured off the dry line and there were a few heart-in-the-mouth moments. However, there was no repeat of the morning's carnage and red flags.
Leaving the scrabbling pack to sort themselves out, MacLeod strung together quick but sure-footed laps to finish in front of Stroll and Maisano.
The series heads to Taupo next weekend.