Maesteg clinched promotion to Division One with a 39-23 victory over Loughor at Llynfi Road. The Division Two West leaders now have their eyes on clinching the title in the final weeks of the season.
Ryan Turner, Ross Powell, Kevin Ellis, Chris Owen and Chris Jones all crossed as the home side romped to a bonus point.
BP Llandarcy and Kidwelly are battling it out for the second promotion spot, with just one point separating them after the weekend's results. Llandarcy won 21-14 against Ammanford but their lead was halved after Maesteg romped to a 39-23 win against Loughor, Andrew Francis and Luke Marshall crossing twice.
Newcastle Emlyn are just a point away from sealing the Division Three West championship after a narrow win over strugglers Cardigan.
Emyr Jones, Carwyn Thomas, Iestyn Crompton and Alex Williams all crossed for the victors as they crept to a 23-21 bonus-point win.
Crymych kept up the pressure on second-placed Llandeilo with a 35-25 win at Haverfordwest. Tries by Gut Griffiths, Kenneth James, Rhodri Davies and a double by Gareth Davies means Crymych can still clinch promotion if Llandeilo slip up.
They did no such thing on Saturday as they met Penclawdd, thumping their hosts 51-22, scoring eight tries in the process.
Lampeter Town boosted their survival hopes with a fine 36-24 win at home to Morriston. Gary Davies, Dewi Williams, Tim Evans and Cerwin Gregson sealed the bonus point for Lampeter, who jump above Cardigan into 10th place.
In Division Three South West, Skewen still have their noses in front after a routine 34-5 triumph at home to Seven Sisters. Fly-half Richard Davies crossed twice, while there were also scores for wing Simon Jeremy, number 8 Edward Price and prop Rhys Jenkins as they took the bonus point.
Tondu are still in with a shout, as they lie two points behind after drubbing Brynamman. Doubles for wing Craig Fox and flanker Andrew Evans helped them to a seven-try, 45-10 win.
At the other end, Maesteg Quins may have already accepted their fate, but still managed a spirited win on their trip to Briton Ferry. Owen Richards, Geraint Evans and Tom Petty scored the tries as they won through, 27-18.
Wales reached their first semi-final since 2013 in the opening round of this season's HSBC World Rugby Sevens Series in Dubai. WRU TV's Graeme Gillespie recaps on what proved to be an eventful tournament
Wales and Ospreys back row James King, who came through the North Wales age grade system, nominated North Wales Regional Community Rugby Manager Marc Roberts, in the WRU's 'Diolch' initiative where squad players thanked those who played a part in their rise to the top.
Beating Merthyr has boosted Carmarthen Quins hopes of reaching a top eight spot in the Principality Premiership. Quins captain Haydn Pugh is delighted with his team's progress and is determined that everyone from the Under 6s through to the senior team, enjoys the ride.
When the Wales squad were asked to nominate individuals who played a big part in their early playing days, Wales and Dragons full back and wing Hallam Amos thought of his former Monmouth School rugby coach John Bevan.
Sam Cross and Luke Treharne have been named as co-captains of the Wales Sevens side as head coach Gareth Williams names his 12-man squad to play in the first leg of the HSBC World Series in Dubai next weekend.
Bedwas head coach Steve Law and players Nicky Griffiths and Alun Rees extol the virtues of the close knit club as they prepare to host third place RGC 1404 - who are one place head of them on the Principality Premiership points table - on Saturday.
Many of the Wales squad have said Diolch (thank you) to someone who played an important part in their early playing days by nominating them to be invited to the Wales v South Africa match. One person, Gowerton Comprehensive geography teacher Mr Dean Mason was nominated by two of his former pupils, Dan Biggar and Sam Davies.
The second WRU disability rugby pilot has been delivered, this time in Caerphilly schools, culminating in a festival at the Caerphilly Centre of Sporting Excellence, Ystrad Mynach tomorrow. Plans are in place to set up a Disability Rugby Club in Newbridge to provide long-term playing opportunities.
WRU TV: Hear from inside the Wales camp as Neil Jenkins discusses this weekend's clash with South Africa and how the squad are looking to put in a strong performance to round of the 2016 Under Armour Series