National surfing champion Caleb Cutmore, 15, won the under-17 men's division at the annual Duke Festival of Surfing.
The Hamilton Boys' High School student won all of his heats over Friday and Saturday to get a spot in the final on Sunday.
As well as winning the GMK Builders under-17s, Cutmore placed fourth in the Exit Surf under-20 division.
Top-ranked Canterbury surfer Harrison Whiteside, 20, was knocked out in the semi-finals.
Astonishingly, 13-year-old Myka Black took first in the under-20 division.
"It's the first time Myka’s beaten me," Cutmore said.
Despite small waves on Friday, Caleb said they picked up throughout the weekend.
"Sunday's waves were bigger but they were messy which made it harder for bigger guys to get up."
The Ray White Duke Festival hosted more 150 surfers from around the country, with 20 different divisions.