The 19 year-old was overjoyed with the win, defeating an elite field of 18 of the world's best 20 year and under pro junior surfers.

"It's the first and obviously the biggest win of my professional career and it couldn't have come at a better time," Wrench said after the win.

"I lost my major sponsor at the start of the season and competing has been hard but this win helps in a big way and hopefully proves that I'm well worth sponsoring.

"The field here was so strong and we have surfed perfect waves all week and it's amazing to win an event like this - it's one of the best events in the world for any pro junior surfer."

Wrench trailed for most of the final after Lacomare opened with a very strong seven point ride.

It was during the final 10 minutes of the final when Wrench found two clean deep rides and used his proven strategy of scoring long barrel rides that he took the lead and eventually the win.

"It's such an amazing wave, you can score big in lots of ways, either tube riding, on-face or even aerials and I found getting the longer tube rides suited me and it worked for me today," Wrench said on Thursday.

For Lacomare it was his second runner-up placing at the event and despite being disappointed was gracious in defeat.

"I would have liked to have won this year but unfortunately I'm second again - the contest is so good and the field so strong.

"We have enjoyed an incredible week of surfing against each other and well done to Sam."

An inspiring performance was also put on by Hawaii's Kai Barger.

Barger suffered a knee injury sustained free surfing and hobbled to the water's edge fully braced around his knee to surf his semi-final.

Early in the semi-final he could barely turn on two extremely low scoring rides and most wondered why he even bothered to paddle out.

Half way through the semi on a good clean medium sized wave, Barger pushed his performance hard, clearly uncomfortable but still showing signs of his renown power and he scored a very worthy six point ride putting him in contention.