Loughor remain on top in Division Two West despite only managing a draw at home to Mumbles in a day of slip-ups at the top of the tables.
Their 17-17 stalemate gave Bridgend Athletic the chance to take their place at the top, but they lost 25-20 at home to mid-table Ammanford and are leapfrogged into second place by Buith Wells who managed to keep their nerve and win 26-21 against Kidwelly.
Gorseinon remain bottom despite putting in a good performance against BP Llandarcy, they eventually went down 23-17.
Pontyberem's winning streak came to a dramatic end in Division Three West, as they lost their first game in 13 with a 16-13 defeat against Haverfordwest.
That allowed Aberystwyth to close the gap with a 13-5 win over Cardigan, with Matthew Green scoring the winning try.
Division Three South West leaders Tondu also slipped-up, losing 7-6 to lowly Briton Ferry allowing Skewen to close the gap to just one point with a 8-3 victory over Maesteg. Aberavon Quins are hot on their heels after a bonus point 45-0 win against Kenfig Hill.
Llandeilo made it 11 wins from 11 in Division Four West with a 36-7 win over Betws, while their closest rivals Tenby United fell to a 36-14 defeat against fellow high-flyers Brynamman.
Bryncoch also remain undefeated at the top of Division Four South West after they emerged 48-5 victors over Neath Athletic. They look red-hot favourites for the title as their two closest challengers Resolven and Ystalyfera both lost.
Cefneithen stay top of Division Five West with a 17-10 win over Furnace United and Abercrave continue their dominance in Division South West with a 58-7 win over Cwmtwrch.
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