Claire Lasko, a student at Lord Williams's School, Thame and member of Oxford Sailing Club, won gold in the RYA Youth Championships.
Sailing with Frances Peters, they became 29er RYA national youth ladies champions in the event at Pwllheli.
The pair showed a blistering display of speed and sailing tactics, scoring two firsts, four seconds and two thirds and a fourth to finish 14 points clear of their nearest rivals.
Victory saw them selected to represent Great Britain in the ladies' high performance dinghy at the Volvo Youth Sailing ISAF (International Sailing Federation) World Championship in Denmark.
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