Ynysybwl suffered their first defeat of the season in Division Two following their heart-breaking 22-20 loss at Newport Saracens.
Simon Skinner's late penalty ended Bwl's three-match winning run and put them into third place in the table.
David Davies had already grabbed a brace of tries for the home side to add to Mark Bale's strike.
Instead, Llantwit Fardre hit the summit with a gutsy 27-26 victory over Rhydyfelin while Treorchy also leap above Ynysybwl into second spot with a six-try romp over Garndiffaith.
Abergavenny top Division Three after grabbing a five-point victory in their 31-3 home win against Croesyceiliog but Rhymney are hot on their heels following a comprehensive 34-3 bonus-point win over Blaina.
Greg Plant, Matthew Chard, Ioan Lane and Liam Buckley scored the tries to gain maximum points for the home side.
Fly-half Steve Lang grabbed 14 points in an impressive display which included three penalties, a drop goal and conversion.
New Tredegar scored six of the best in Division Four on their way to a comfortable 37-7 win at home to St Josephs.
But home dominance did not sweep the division as Old Illtydians, Risca and Talywain all recorded away wins at Machen, Abertillerty BG and Monmouth.
Wales Head Coach Rob Howley talks to WRU TV's Sebastian Barrett about the 36-man squad he has just named for the forthcoming Under Armour series, which includes two uncapped players, Ospreys duo Sam Davies and Rory Thornton.
Head coach Rowland Phillips is deligthed he can now call BT Sport Cardiff Arms Park home for his Wales Women's side, who launch their international season next month with games against Scotland and UK Armed Forces in the heart of the capital city.
Wales Sevens star Sam Cross has put his home town club of Brynmawr on the map after winning a silver medal at the Rio Olympics with Team GB. His club have now honoured him by naming their players bar after him, as WRU TV discovered at the official launch, recently.
One of the newest members of the Principality Premiership, Bargoed admit it's proving to be a steep learning curve at the highest level, but are determined to become a force to be reckoned with. WRU TV visited the club last weekend when they took on Llanelli.
Table-topping Aberavon travel to north Wales to tackle RGC 1404 as both teams defend unbeaten starts to the season in the Principality Premiership. WRU TV's Graeme Gillespie visited the Wizards to see how their preparations were going for the game of the weekend.
The Half a Game initiative is currently sweeping across Wales and proving a major success. The scheme aims to give every young player at least half a game every weekend. WRU TV recently visited a festival in Narberth where clubs have fully embraced the initiative.
Both Bargoed and Swansea were seeking their first win of the Principality Premiership season this afternoon. It proved a fruitful day for the hosts - not only did they win, but Bargoed claimed a try bonus point.
Cardiff managed to keep their unbeaten record at home intact, but only just as Bridgend made them work extremely hard before the Blue and Blacks secured a hard fought Principality Premiership win at the BT Sport Arms Park last night.
Former Wales back row Andy Powell gives a guided tour of The Wern, home of Merthyr RFC, who are determined to prove a lot of people wrong and make their mark in their first season in the Principality Premiership.