Caitlin and Annie McCullough enjoyed a special day at the Clubworld Ulster junior, with three trophies heading back to their Belfast home.
The twins, members of the Windsor club, started the day by facing each other in the under-16 final and, having shared the under-16 and under-18 titles at Ballycastle in two tight encounters, it seemed inevitable that yesterday's decider would be of a similar ilk.
For two hours and 20 minutes they slugged it out from the baseline and after Annie edged the first 6-4, Caitlin then took over to win the next two 6-1 6-2.
The girls then returned to the court for the under-18 doubles final and produced a superb performance, defeating Vivienne Bond and Aoibhinn Kelly 6-0 6-1.
A couple of hours later the Windsor girls found themselves up against each other once more, this time in the Under-18 mixed doubles.
In another close battle it was Annie and Ben Cree who triumphed, defeating Caitlin and Rex Lloyd 6-4 7-6.
It capped a great day for the girls and for the Windsor club, coming just hours after Karola Bejenaru's victory at the ITF event.
Windsor coach Przemek Stec hailed the success of the girls who have been under his guidance for only 12 months, having moved here from Singapore.
Stec said: "The girls have done very well this year. They have made a very big jump since joining the squad and I'm very proud of them.
"They love their tennis and in the squad they listen well and work very hard and away from the court I know they also work very hard on their fitness. It was a pretty good day for the club.
Bangor lad Matthew O'Boyle picked up his first Ulster junior singles title with another comeback victory in the under-16 final.
Having saved four match points in his semi-final with Ben Jennings on Thursday before triumphing, O'Boyle found himself a set down against Enniskillen's Jared Monaghan in the decider.
But, having seen a number of unforced errors fly off his racquet in the opening set, O'Boyle went through the gears in the second set and went on to win 6-1 6-4. He will now target a good run at the Irish championships in two weeks time.
Lucy Octave (left) came through to triumph in the girls under-18 final with a very impressive performance.
Donaghadee girl Octave got off to a great start and held the initiative against Emily Beatty, winning 6-2 6-1.
In the boys final, Octave's clubmate Aaron Stubbs proved too hot for Comber lad Matthew McClurg, winning 6-3 6-1.
There was an upset in the girls under-14 final when the number two seed Amy Rothwell of the Bangor club came from a set down to defeat Enniskillen's Sarah Cousins.
Cousins edged the first 6-4 but then Rothwell got on top and ran away with the next two sets, 6-2 6-0.
Peter Corrie claimed the under-14 boys title, defeating Ben McClurg 6-2 7-5.
Other results: Under-12 girls final: Mary Parkash bt Jessica Moore 6-3 6-0.
Under-12 boys final: Harry Ellesmere bt Jacob Fleming 6-0 6-1.