Sean Emery, Gavin Heck and Cleris James all went over as Newbridge were forced to work hard at home for their victory over Waunarlwydd for whom Simon Hart crossed twice.
Beddau had a far easier time of it at struggling Fleur De Lys where they ran in six tries, five of which were converted, in their 40-0 rout.
But neither could close the gap on leaders Bonymaen who returned to winning ways to stay four points clear at the top of the table.
Bonymaen slipped to only their third defeat of the campaign last week with a shock reverse at relegation threatened Builth Wells.
But they shook off that disappointment to get back in the driving seat with a commanding 38-17 success against Merthyr. Wing Lyndon Johnson scored two of their five tries while fly-half Gareth Jones added 13 points with the boot.
Assistant coach Ieuan Jones said: "It was important to get back on track after the defeat at Builth. We've still got the other teams breathing down our necks but we have games in hand and we know that our destiny is in our own hands.
"Perhaps a bit of complacency crept in last week but it was a good kick and now if we win our games then we know the title is ours.
"We made hard work of it against Merthyr. After a good start we allowed them to get back into the game but we finished strongly."
At the other end of the table, Ystrad Rhondda looked to be heading to a rare victory when they lead at half-time against Llangennech through tries from Alun Roberts and Richard Wells before the visitors rallied to run out 27-13 winners.
Whitland played the last ten minutes of their clash against Uwic with just 13 men after forwards Ryan Mitchell and Randall Williams were sent to the sin bin but managed to hold on for a 29-17 win.
Gareth Edwards and Justin James scored the crucial tries for Llanharan who edged out Caerphilly 18-7 in a nail-biting encounter at the Dairy Field while Cwmllynfell came from behind to beat Blackwood 20-7 after trailing at half-time.
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.