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.
Nearly 40 players were involved in the first Wales Under 18 training session of the season. WRU National Performance Manager Gethin Watts is excited at the potential shown by the group and expects the Regional Under 18 Championship to hone their skills even further.