The boot of Sam Davies failed to stop Swansea slipping to defeat at home to Cornish Pirates
In the remaining British & Irish Cup games to take place this weekend, Llanelli made sure Craig Hawkins' 200th game for the club was one to remember with a 32-23 win over London Scottish.
The home side ran in three tries at Parc y Scarlets as they made amends for their defeat away to the same opposition last weekend.
And they caught their opponents off guard from the from the first whistle, Nic Reynolds slicing through the Scottish defence to touch down.
Things then got better for Llanelli when Diggy Bird extended their lead with a penalty before scrum-half Gareth Davies added a simple try, converted by Bird.
The home side were at their best and added another try after just 14 minutes when full-back Dion Jones chipped ahead and recovered the ball brilliantly to score.
Centre Oli Grove got the visitors back into things with a converted try and he then added his second score in response to another penalty from Bird.
In a dramatic second half, each side had chances to seal the win as both kickers exchanged shots at goal. But it was Llanelli who were to grind out the win, a penalty from replacement fly-half Owen Williams ending Scottish's hopes.
In Pool 3, Carmarthen Quins' hopes of progressing to the quarter-finals were hit by a 25-23 defeat away to Dundee.
After a win over the Scottish side last weekend, Quins travelled north in confident mood but were edged out in a narrow defeat. James Dixon was among the scorers for Quins as they were outscored three tries to two by the Scottish side.
Quins' defeat means Cornish Pirates are now firm favourites to progress from that pool and they strengthened their position with a 10-30 win over Swansea at St Helens.
The English side led narrowly 7-10 at half time but pulled clear in the second half.
Both Bridgend and Cardiff faced tough clashes with Bristol and Ulster respectively while Newport were on the receiving end of a hungry Newcastle at Kingston Park.
Elsewhere, Neath and Cross Keys put in credible performances on their travels which bode well for their return to Principality Premiership action over Christmas.
Dorian Jones went over and his namesake Steffan kicked the rest of the points but it was not enough to prevent Keys slipping to a 31-16 defeat away to Connacht.
Neath lost out to Bedford while in Pool 7, Aberavon were beaten away at Plymouth Albion.
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