Josh Harrop, of Wantage White Horses, won both the 100m and 50m backstroke events at the City of Oxford Open meet.
The 12 -year-old backed up his performance with second spot in the 50m free and fourth-placed finishes in the 100m and 200m freestyle.
Wantage's Guy Giles, 13, won the 50m freestyle and was second in the 100m race, while Robert Bowles, 17, won his age group 400m freestyle.
Backstroker Fraser Capill, 12, was second in the 100m and fourth in the 50m and 200m.
Also securing top-six top positions were Harry James, 12, in the 50m breaststroke and Esme Gardiner, 10, in the 100m and 50m breaststroke.
Rachael Bedford, 15, set a Wantage age group record in the 200m freestyle.
Abingdon Vale's Imogen West, 15, broke a club record with her 200m backstroke swim of 2.30.34.
West also got a personal best in the 400m freestyle with a time of 4.49.19.
Other Abingdon pbs: Jordan Barker, Tim Blackman, Holly Chrisp, Hannah Curtis, Nicola Curtis, Michael Fabes, Helen Gildersleeves, Amie Hamilton, Charlie Hedderley, Richard Higgs, James Law, Olivia Law, Nienke Lijzenga, Sarah Machin, Dylan Mainard, Jamie Saulter, Alex Talbot, Anne Taylor, Daniela Valovicova, Emma Walton, Amey Whittall, Joshua Whittall.
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