It was a top-of-the-table showdown at The Wern on Friday, as Merthyr took on Pontypridd in a mouth-watering derby encounter, while Cardiff looked to extend their winning streak to six games as RGC 1404 visited the Cardiff Arms Park.
Merthyr 20 Pontypridd 14
Only three points separated Merthyr and Pontypridd heading into Friday night's huge top-of-the-table clash.
Wet and windy conditions had an impact across the Principality Premiership schedule, and The Wern was no different.
The visitors opened the scoring thanks to a Lewis K Williams penalty, however it didn't take long for Merthyr to strike back.
A break from former Sardis Road favourite, Adam Thomas, put the hosts on the front foot, and former Cardiff Blues outside half, Gareth Davies, spotted a gap in the defence to run in under the posts.
A strong driving line-out put Pontypridd back ahead, courtesy of prop Gareth Smith, but the lead didn't last long as Sam Hobbs replied in similar fashion.
Williams pulled the scores level on the hour mark, but two late penalties from Matthew Jarvis gave Merthyr a crucial victory in the hunt for the Premiership title.
Cardiff 25 RGC1404 19
Following five wins on the bounce, Cardiff welcomed RGC1404 and the BBC Scrum V cameras to the Arms Park in full confidence, as they looked to climb the Premiership table.
The weather conditions were equally dreadful in the Welsh capital, but Steve Law's side opened the scoring, as Will Rees Hole picked out a pin-perfect line in midfield, to touch down under the sticks.
Steffan Jones added the extras, but the North Wales outfit brought the scores back level as Evan Yardley dotted down after a strong driving line-out.
Mark Jones' side found themselves ahead at the break, as replacement wing Aron Evans scored a sensational individual score.
However, Cardiff came out firing in the second half. Martin Roberts set-up Adam Jones for a try in the corner, while Steffan Jones added anothe rpenalty to extend the lead.
A decisive score was secured as captain Joey Tomlinson took advantage of a rampant driving maul, which has been an effective tool for the Blue and Blacks in recent weeks.
Evans scored a late consolation score for the visitors - his second of the game - converted by Billy McBryde, but Jones had the final say as his lat penalty made it six from six for Cardiff.