Rydal Penrhos pupil Efan Jones was part of the Wales U18 side who triumphed 17-8 over France on Friday night.
Despite the muddy pitch making things difficult for both sides, the hosts prevailed at Pandy Park to make it four wins from four for Welsh teams over their French counterparts.
Wales scored two tries through Phil Jones and Will Jones to secure the victory, with 18 year-old scrum half Efan playing a leading role in the hard fought victory.
France took the lead in the opening quarter through a try from Romain Ntamack, but when Jones spotted a gap a minute later he ran through the middle of the French defence to score.
He converted his own try and added a penalty, helping the host nation to a 10-5 lead at the interval.
Captain and outside half Thomas Darmon brought France to within two points with a second half penalty but Wales held on during the third quarter.
The defence and set-piece were strong and there was a clear intent to attack. Right wing Pat Lewis was unlucky not to be rewarded for his efforts and shortly after being held up over the line, and with only a minute remaining, coach Geraint Lewis saw openside flanker Will Jones cross the muddied whitewash for a try that Ben Jones converted to secure an outstanding collective victory.
Lewis said; "It's great for Welsh rugby to have got four wins against the French over the last two weekends.
"In fairness to the boys, they dug in and slogged it out. The conditions didn't make it easy, but both sides tried to play.
"France have such a wealth of talent at age grade level, and their forward pack was huge tonight, but we fronted up well, and can look forward to playing England next weekend."
Efan, who has appeared a number of times for the RGC senior side this term, will now turn his attention to the cross border derby with England U18s at Aberavon on Sunday, March 13 (5pm).