Twin sisters Annie and Caitlin McCullough booked their place in the national matchplay finals after coming through the Ulster qualifier at the Boat Club yesterday.
Annie sprang a surprise when she defeated Ulster senior champion Lucy Octave in a closely contested U18 final which went to the wire.
Lucy took the first set 7-5 but the Windsor player recovered to square the match and then prevailed in the third to win 5-7, 6-4 (10-8).
However as girls' tennis in that age group is particularly strong in Ulster, five qualifiers advance to the national finals in two weeks.
The two finalists will be joined by Laura Reid, Emily Beatty and Caitlin McCullough who claimed the remaining places.
Laura defeated Emily 6-3, 6-3 in the third place play-off, while Caitlin took the last available qualifying spot after beating Enniskillen's Laura Griffin 6-3, 6-2.
Hilden's Peter Corrie beat Windsor's Matthew McClurg in the U16 final but both players qualify.
Jordan McKeown won the U16 boys' event, while Jessica Leeman took the honours in the corresponding girls category.
Meanwhile, Ulster's Peter Bothwell didn't get a taste of the action as Belarus completed a 5-0 whitewash over Ireland in the Davis Cup tie in Dublin yesterday, Sam Barry and Daniel Glancy both losing their reverse singles in straight sets.