SEB Rey and Lillie Owen, from St Hugh's, Faringdon, claimed singles' titles at the National Prep Schools Tennis Championships.
Rey edged out Marc Huttman, from St Anthony's, London, 7-6 to become the under 14 boys' champion at Queenswood School, near Hatfield, Hertfordshire.
And Owen swept aside Ellie Stevens, from Culford, Bury St Edmunds, 6-1 to take the under 14 girl's crown.
Rey also teamed up with Ollie Greensted, who reached the singles' quarter-finals, to win the doubles.
They beat Charlie McElvey and Charlie Pisker, from Tower House, London, 6-3 in the final.
Their wins helped St Hugh's become the most successful school at the tournament, which featured more than 270 players from more than 50 prep schools.
Owen also finished runners-up in the doubles with Juno Anderson.
Rebecca Perry and Katy Law were runners-up in the under 12 girls' plate, while Isobel Lloyd reached the last eight of the under 12 girls' singles.
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