City of Oxford's Ben Chapman claimed two gold medals at the South East Region Age Group Championships in Crawley.
The 14-year-old gave imperious performances in both the 800m and 1500m freestyle events.
In the 1500m, he finished the 30-length race more than a length ahead of the rest of the field in 17.15.00 - 20 seconds inside the National Qualifying Time.
His 800m time of 9.00.60 was equally impressive and he achieved a third personal best with his fourth-place finish in the 200m freestyle.
In the 12-year-olds section, City's Molly Williamson took silver in the 1500m freestyle. She also came fifth in the 200m butterfly and fourth in the 800m freestyle.
Swimmers from 75 clubs competed in the championships.
In the boys' events, City's 11-year-old Thomas Ruddell came sixth in the 1500m, after recovering from illness, and there were strong performances from Jack Godsden-Kaye, 12, and Drew Finnigan, 14, who achieved a near six-second personal best in the 200m freestyle, finishing in a time of 2.09.54.
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