Another Czech Republic paddler, Jakob Krejci, won the men’s under-23 kayak final.

The final gold on offer in this International Canoe Federation (ICF) event on the testing Tacen course at Ljubljana today went to Italian Martino Barzon in the men’s junior canoe event.

The Kneblova sisters became the first siblings in the history of international canoe slalom to win a gold and silver medal.

Klara, 16, said it was one of the first times she had ever finished in front of her 18-year-old sister.

She was the last paddler on the course and was unaware it was her sister’s time she would need to beat to take the gold.

"I didn’t know that until I got to the finish line and saw, it was amazing," she told ICF.

"She said to me ‘oh my God, we did it, can you believe it?’

"We have a good relationship.

"I have never been better than her on water, so this is maybe the first time.

"It’s amazing".

Bronze went to Tokyo-bound Evy Leibfarth of the United States, who dropped from first to third after picking up six seconds in penalties.

Charel was the slowest qualifier into the women’s kayak final, but went into the race knowing she had already recorded her best ever result.

She was not confident of winning a medal after picking up four seconds in penalties, but then watched on as the remainder of the field struggled to tame the difficult course.

"I don’t believe it, it’s amazing at my first World Championships," she said.

"On the finish line I didn’t think I could do it, I thought other runners would be better.

"I went in knowing I had nothing to lose, everything to win".

Charel finished just 0.14sec ahead of French team mate Romane Prigent, who had topped qualifying, with US teenager Ria Sribar winning her first international medal by finishing third, just 0.32 off the gold.

Many of the more highly rated paddlers failed to make the final of the men’s under-23 K1, throwing the race wide open.

But the performance of Krejci, contesting his first under-23 world titles after winning silver at a junior level, left the gold medal in no doubt.

"I love this channel, I love this experience, I have such good memories of this course," Krejci said.

"I was very nervous before the start, but I wanted to win. I felt very good during the race, I felt confident".

He finished 2.36sec in front of Britain’s Jonny Dickson, with another British paddler, Christopher Bowers in third.

In the men’s C1 junior final Italy’s Barzon produced one of the most impressive runs of the day, posting a time of 91.92 with a two-second penalty to secure the gold.

"I have Olympic dreams, I want to win a gold medal," Barzon said.

"That is my dream".

Martin Kraotchvil and Adam Kral added to the Czech Republic’s medal haul with silver and bronze.

The Championships will continue tomorrow with semi-finals and finals in the men’s and women’s under-23 canoe and the junior kayak.