Jo Jackson refused to blame the conditions after finishing 23rd in the women's 20 kilometres walk at the World Championships in Daegu on Wednesday.
On a humid morning at the Gukchae-Bosang Memorial Park, the Briton trailed Russian winner Olga Kaniskina by almost six minutes in a time of one hour 35 minutes 32 seconds.
"I found the conditions fine, I kept myself really well hydrated," she said.
Ireland's Olive Loughnane, the silver medallist in 2009, finished 16th.
In the only event on day five of the championships, 26-year-old Kaniskina became the first woman to win three successive 20km walk titles at the World Championships as she continued a run of success that also saw her become Olympic champion in Beijing.
"I try not to think of my previous victories and instead I just focus on the race ahead. I want to win every competition I take part in," she said.
Jackson, disqualified in Berlin in 2009, took some solace from finishing this time.
"I went into this with a bit of a knee niggle and it's caused a bit of trouble with my technique, but I wouldn't use it as an excuse," she said.
"It was nice to get rid of the Berlin memories but I would have liked to have been in with the front group. I kept fighting all the way through, I didn't give in."
Thursday's action includes Dai Greene hoping to secure Britain's first gold at this year's championships in the 400m hurdles while 10,000m silver medallist Mo Farah begins his 5,000m campaign.