"Duathlon is not my strength, I am more a swim-biker, so I took the opportunity to get a lead on the return leg bike and that ended up being just enough to get the win."
Phillips is now eyeing the New Zealand Ironman in March.
Currie's day was tougher than intended, the defending champion riding the 90km cycle in one gear due to a mechanical glitch.
Thailand-based Watkinson stamped her mark on the race with a 3h 59m 42s win, breaking the field on the bike back from Reporoa into Taupo and the transition to the run.
"That wasn't an easy one out there," she said. "I wore a few layers to make sure I didn't get too cold, and I managed to hold on to the lead after making a break on the bike, but that run was tough."
Second place went to US athlete Jocelyn McCauley, coming off her off-season, who clocked 4h 01m 00s, while unheralded 22-year-old Australian Laura Dennis was third in 4h 02m 23s.
- NZN