Dunstan is now the leading contender to take out the Eves Series, with the Coronation Classic to come on March 1.
Matilda Lawrence from Mount Maunganui was a delighted winner of the women's sprint distance in 1:07:52, ahead of Cambridge's Vicki Wade and Te Puke's Deirdre Lack.
She has been competing seriously in triathlons for only six months but says she has made incredible gains, thanks to training with the Beyond Adventure group.
"It was my first win today. I was happy with my bike. I have made massive gains on the bike in the past few week's training and it used to be my weakest one.
"I am going to have a go at Kinloch and my biggest goal this year is the Xterra cross country triathlon in Rotorua in April, just after my 30th birthday. I am looking forward to it, as I like the hills."
Another first time winner yesterday was Jamie Shields in the super sprint category. He won in a time of 34:53, with Matthew Lochhead second and Hannah Knighton third.
Shields, 14, has been competing in triathlons since he was 9 and is part of the Tauranga Triathlon Youth Academy run by Chris Willett. "I was most happy with my swim, because I am usually a bit slow, and I did well in my run after the bike," he said. "The hardest part was going into the head wind on the bike, because I couldn't find the right gear. But I am happy to win, as I usually come second or third."