It was not her strongest performance by a long shot, but Australia's Olympic silver medallist Jessica Fox went through on Friday to the K1 semi-finals at the world canoe slalom championships in the Czech Republic.

Fox found herself in 10th position after her first-heat run and then slipped back even further to 15th after her second run.

"It was a qualification race so I had a couple of mistakes on both runs," Fox said.

"I improved my time on my second run, but the touches pushed me down in time. I'm not worried. It's about the process and building my racing.

"Sometimes, I tend to get too carried away in the heats and the semis and it doesn't come together in the final, so I just want to build my racing and hopefully put together a good run in the semis."

Fox said she was not worried about the sense of expectation which surrounded her appearance in Prague. The 19-year-old is a short-priced favourite to win the C1 gold, and a strong chance to at least win a medal in the K1 Olympic event.

"I try not to think about that. I try just to focus on the process and not the results, the paddling and the way I'm feeling on the water."

Another Australian Ros Lawrence delivered a scorching second run to qualify 10th for the K1 semi-finals, while Sarah Grant made it safely through in 19th off the back of a strong second run.

The K1 final will be held on Sunday, 24 hours after the C1 final.