Neil Jenkins scored 23 points as Pontypridd ground out another win to stay on course for a place in the Celtic League quarter-finals.
The Borders outscored their hosts by three tries to one and proved they are getting better with every game, despite the fact they remain winnless in the Celtic League.
"It was a hard earned victory and we didn't really perform. It was disappointing, but at least it was a win," said acting skipper Jon Bryant.
The robust Borders pack drove New Zealand flanker Campbell Feather over the home line for the game's first try in the opening half. That broke the deadlock after Kevin Utterson and Jenkins had swapped early kicks.
In the second half, Scotland and Lions outside half Gregor Townsend ghosted over for a try at the posts, but the ever reliable boot of Jenkins kept his side in contention.
Then some quick thinking from Wales back row man Michael Owen from a five metre penalty earned Ponty a try.Owen caught the Borders defenders napping as he ignored a penalty opportunity for Jenkins and drove over the line.
Jenkins added the wide angled conversion to leave the Scots chasing two scores to win.
In the end, they managed to send international wing Craig Moir racing 30 metres fro a try which Utterson converted with the last kick of the game to ensure a bonus point for the visitors.
Pontypridd lost their international flanker Richard Parks with a facial injury in the second half when he got a finger in his eye.
Scorers: Pontypridd: Try: M Owen; Con: N Jenkins: Pens: N Jenkins 6; DG: N Jenkins. Scottish Borders: Tries: C Feather, G Townsend, C Moir; Cons: K Utterson 3; Pens: K Utterson 2.
Wales U20 captain Tom Phillips and performance psychologist Dr Rich Neil explain why spending three days at Monmouth RFC has further strengthened the togetherness of the squad ahead of the #WorldRugbyU20s
Alongside Scarlets flanker James Davies and Cardiff Blues centre Cory Allen, three Wales Sevens core players have made the extended training squad for GB Sevens. Wales Head coach Gareth Williams tells WRU TV's Graeme Gillespie why Luke Treharne, Sam Cross and Luke Morgan earned selection in the initial training squad for Rio.
Wales Sevens head coach Gareth Williams tells WRU TV's Graeme Gillespie he has had to overcome a number of injuries before naming a competitive squad for this weekend's penultimate round of the World Series in Paris.
Merthyr were officially crowned champions of the SSE SWALEC Championship at Dowlais on Saturday where captain Andy Powell paid tribute to his side who have earned promotion to the Principality Premiership
Coleg y Cymoedd's season has had a spectacular ending with victory in two cup finals and a massive victory over one of the best rugby playing schools in the world - Welsh coach Warren Gatland's old alma mater, Hamilton Boys' High School.
WRU chief executive Martyn Phillips hosted the second meeting of the WRU Youth Board last weekend ahead of the Judgement Day IV regional double-header. Tthe board, made up of 15 under-21-year-olds from around Wales, heard presentations from head of participation Ryan Jones, policy and integrity manager Jeremy Rogers and national women's rugby manager Caroline Spanton, with Pro Rugby Wales CEO Mark Davies also on hand to hear the range of views aired.
Wales duo Rhun Williams and Liam Belcher, who makes a welcome return after five months of injury woe, look ahead to next month's World Rugby U20 Championship in Manchester where they will face Ireland, Georgia and New Zealand.