HUDDERSFIELD Giants' Junior Academy side remain unbeaten at the top of Division I after their 20-6 triumph at Hull KR.
But the understrength Seniors suffered a first defeat of their First Division campaign after going down 51-32 at leaders Leigh Centurions.
The Under 18s produced another fine defensive display to secure the League points.
A week ago, coach Chris Plume's side restricted Salford to four points and were again dominant in the tackling department as they saw off the Robins.
The platform for victory was laid by Glenn Holdsworth and Jack Watson, who were both solid as a rock as the Giants opened up a 14-0 interval lead.
It wasn't until the 28th minute that they broke the deadlock when Danny Garside crossed for a try after good work from Richard Knight and Peter Robinson.
Four minutes later the visitors were over again with a close-range effort from Holdsworth and just before the break Luke George darted over from dummy-half for a try converted by Garside.
The momentum was maintained in the 49th minute when Andy Tillotson crashed over for a second converted score and at 20-0 the outcome had already been settled.
Gavin Drury scored Hull KR's only try, converted by Dave Page, in the 76th minute, but it failed to take the gloss off a solid Huddersfield success.
Unfortunately, it was a different story at Leigh as the Under 21s suffered a first League defeat.
It was always going to be tough for the Giants, with coach Lee St Hilaire forced to travel with a makeshift side.
Injuries to players at Super League level obviously had a knock-on effect, while the visitors were also lacking on-loan duo Matthew Whittaker and Ben Cooper.
Furthermore, Thomas Hemingway was on Yorkshire Junior Academy duty.
And it was soon taking its toll as a far stronger Centurions side took control from the start.
By half-time they had built up a 26-10 lead and were able to cement that advantage after the break.
There were, however, several bright moments for the Giants.
The highlight was a hat trick from Marcus Southwell, while brother Jason was also on the scoresheet.
Jonathan Grayshon and Tom Senior were the other tryscorers, with Tony Williams landing four goals.
But the main man for the Giants was hooker Kris Lythes, who has now been recalled by Batley Bulldogs.