Cardiff RFC and Merthyr are on track to set-up an inter-regional clash in the WRU National Cup final, but will have to negotiate past tricky semi-final opponents in Llandovery and Pontypool respectively.
The Ironmen booked their place in the final four of the cup with an enthralling victory over rivals Pontypridd at The Wern on Friday.
Indiscipline from both sides saw Ceri Sweeney and Matthew Jarvis slotting from the tee, as Ponty racked up an early 6-3 lead.
Scrum half Rhys Downes finally broke the stern away defence to touch down for the first try of the evening, but full back Gary Williams soon replied for Justin Burnell's side, thanks to a galloping run from experienced lock, Chris Dicomidis.
Man-of-the-match Terri Gee touched down to give the Ironmen the lead once again before the interval, before Osian Davies compounded Pontypridd's misery to cross with 10 minutes remaining, despite Merthyr being down to 14-men.
Dale McIntosh's side have been pitted against 1983 winners, Pontypool, in the semi final stage, which will be held on the weekend of April 5, with a venue yet to be confirmed.
Meanwhile, Cardiff progressed to the final four with a comprehensive win over Bedwas at Cardiff Arms Park.
Gareth Thompson's ever-reliable boot opened the scoring before Cardiff Blues academy centre, Ben Thomas, manufactured the game's opening try for influential number eight, Morgan Allen.
Will Rees-Hole and Joe Gatt added further scores to take the Blue and Blacks into half time with a 24-point lead.
The second half became an arm-wrestle between the packs, with strong diving line-outs resulting in tries for each side, with skipper Joey Tomlinson touching down for the hosts' fourth of the afternoon.
While Bedwas did add a second try, Steve Law was in no mood to allow his former side to mount a stunning comeback, with front row Ian Jenkins adding a brace of tries in the latter stages of the game to set-up a semi final clash against Llandovery.