Earlier in the day, Genie Bouchard and doubles partner Sofia Kenin reached the ASB Classic doubles final following a tough three-set loss for Bouchard to No. 2 seed Julia Goerges in singles.
Andreescu won the first set and led 5-4 in the second set - leaving her only four points from title - before Goerges began her comeback.
But Gorges fought back to take the match 2-6 7-5 6-1. Goerges was in near flawless form as she raced through the first set in under 30 minutes with a power game that forced Kuzmova well behind the baseline.
Andreescu could not stay with her esteemed opponent and immediately lost her serve in the third, giving Goerges a platform to see out an ultimately comfortable victory following a pair of further breaks.
"It is disappointing, I was one game away from winning the match, so I'll probably be thinking about this for the next couple of days", said Andreescu, who earned entry into the tournament as a qualifier. Starting off the new tennis season, Andreescu has made diversifying her game a priority.
"I think I've been doing that this whole week, and I'm beyond grateful right now", she said.
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"I've had an awesome week, beaten a lot of top players and I'm really proud of myself".
"I believe that anything is possible and tonight I think I did the impossible", Andreescu said in an on-court interview after the match.
But it was Goerges' night as she went on to capture a seventh WTA crown and continue her reign in Queen City. "Bianca gave me a hard time today".
While unable to finish her brilliant run with the trophy, Andreescu was still able to reflect on what had been a breakthrough tournament.
Goerges sensed the opportunity, and converted her second set point to level the match.