Double Commonwealth champion Caitlin McClatchey admitted she did not expect her new British 100metres freestyle record to last longer than the next race at the British Championships, doubling as the Olympic trials, in Sheffield.
The 22-year-old produced her customary smooth race to finish in 54.31seconds and eclipse the record set in January by Fran Halsall at the same Ponds Forge pool.
However, with European medley relay champion Halsall swimming in the next race, McClatchey freely admitted she expected the teenager to immediately reclaim the record.
However, Halsall managed only 54.88secs, although clearly comfortable, to give McClatchey a clean sweep of British freestyle records in 100m, 200m and 400m.
The Scot, who revealed she had missed some training due to illness, said: "I thought Fran Halsall was going to break it. I feel in really good shape
"All I wanted was to get the qualifier. I am very happy to get the record but didn't think it would last past the next heat."
Swimmers have to achieve the Olympic qualifying time set by British Swimming in the heats and then need to finish in the top two in the final for consideration for selection for Beijing.
McClatchey and Halsall were the only competitors to do this in their event and will face each other in Tuesday morning's final.
Jemma Lowe was stunned after marking her 18th birthday by becoming a double British record holder.
Lowe led from start to finish in the 200m butterfly to finish in two minutes 06.64 seconds, knocking more than two seconds off the record held since April 2004 by the now retired Georgina Lee.
It was also a personal best of almost three seconds for the Borough of Stockton swimmer who claimed the 100m fly record in the same pool last summer.
She said: "I really wasn't expecing that.
"I just tried to to kick my legs as hard as I could.
"I was confident I had got the qualification time but I was not expecting that time at all.
"I just can't bleieve it."
In what has become a strong event in Britain, Ellen Gandy, Jessica Dickons and Hannah Miley also achieved the qualifying time meaning four swimmers will be chasing two places in the finals on Tuesday morning.
Elsewhere, Dean Milwain knocked two seconds off his personal best as he qualified fastest for the final of the 400m freestyle in 3mins 48.40secs.
Olympic and world 1500m free bronze medallist David Davies and British record holder David Carry also achieved the qualification mark meaning the trio will vie for two places in Tuesday morning's finals.
Matt Clay, Gregor Tait and Marco Loughran achieved the qualifier for the 100m backstroke. However, with world double bronze medallist Liam Tancock pre-selected, they will fight it out for just one place.
Sam Hynd set a new world record of 4:32.92 in the men's multi-disability 400m freestyle.
The event at Ponds Forge runs until Sunday with the finals being held in the morning session to replicate the programme at Beijing.
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