Rotorua kayaker Zack Mutton has equalled New Zealand's best-ever individual result at a junior canoe slalom world championship, finishing eighth in the K1 final in Bratislava, Slovakia.

It could've been so much better, however, with his raw time good enough for a bronze medal but two penalty touches, on the 16th and 22nd gates, proving the killer.

It meant he clocked 99.34secs, 7.16secs behind winning Austria's Felix Oschmautz, with Czechs Tomas Zima and Jan Barta filling the minor placings.

'It was a very difficult course and the run didn't really go to plan - it was a little bit off the whole way,” says Mutton.

'I was super-stoked just to be there though. There was a lot of pressure in the semifinal but I put down a good run and managed to get through, so everything from then on was a bonus.”

Double Olympian Mike Dawson's 10th in 2004 and Callum Gilbert's eight in 2014 are the only other two times a Kiwi has made a junior world championship K1 final and Mutton was delighted to join the vaunted pair, who are both classy senior paddlers now.

And the Okere Falls 17-year-old still has one more year in the junior ranks, which gave him plenty of confidence.

'Making the final has been a goal for a very long time now so I'm happy to complete that and I couldn't stop smiling on the start line.

'I guess there's disappointment I wasn't able to perform how I wanted to but I've still got next year. And I know I'm good enough to compete with these guys now too.”

Emphasising how tough the course was, no paddler went clean in the final, while Mutton was one of only three non-European paddlers, heading off United States duo Tyler Smith and Joshua Joseph.

The European dominance continued in the under-23 division too, where Gilbert and Finn Butcher both exited in the semifinals after missing gates and incurring 50sec penalties.

Butcher's 93.07 raw time would've qualified him in sixth but the 56secs' worth of penalties dropped him 29 places back to 35th, two spots behind Gilbert.

'Once again, I was feeling really good in the boat but I hit gate 7 with the very front of my boat and it swung around me,” Butcher lamented.

'It was an unlucky swing of the pole but I wasn't quite accurate enough on getting through the poles in the first place. Despite that, I actually had quite a fun run, the course was flowing a lot more than the heats and with a couple of spins in it, was a bit trickier.”

Gilbert came unstuck on gate 11 and added a touch on gate 15 to pick up 52secs in penalties.

'Gate 11 was a tight upstream and I thought I was in but after looking at the video, it's clear I was too tight,” says Gilbert.

'Other than that and another small mistake, the run was pretty good!”

Slovakia's Jakub Grigar landed an emotional home-town win, with the defending under-23 world champion and two-time world junior champion smashing the under-23 final in 89.86secs, almost two seconds clear of Austria's Mario Leitner in 91.89, with France's Mathieu Desnos third in 93.51.

Butcher and Gilbert will now return home to prepare for September's senior world championships in France and the rest of the ICF World Cup series.

'It's still early in the season and the big goal is at the end - there's so much to learn from this race and work on at home to prepare for the worlds in Pau,” says Butcher.