The Scarlets clung on to make it two out of two, and nine points out of a possible ten, to lead the way in Pool 5 of the Heineken Cup...
The home side got off to a flying start and scored their first try within three minutes after Regan King had regathered his own charge down on opposite number Paul Steinmetz' kick ahead.
That opportunist try was almost followed by another eight minutes later when Wales wing Mark Jones took an inside pass from namesake Stephen.
Jones managed to cross the line but lost the ball in the tackle, and referee Tony Spreadbury awarded an Ulster scrum instead of a try, after consulting with the video ref.
Stephen Jones increased the Scarlets' lead with a 27th minute penalty, but two penalties in the space of two minutes from the ever accurate David Humphries cut the deficit to two points before Jones sent his side into the interval 11-6 ahead with a penalty from the last kick of the half.
Having started the first half so badly, Ulster were the dominant force in the opening exchanges in the second half. Humphrys kicked his third penalty and the visitors looked ready to cause an upset.
The Scarlets conjured up a second try for wing Mark Jones that went through nine phases and 26 pairs of hands before he crossed the line.
Stephen Jones' touchline conversion looked to have put some distance between the two teams, but Ulster refused to give up and two more Humphries penalties got them back to within three points after 64 minutes.
Another Jones penalty gave the Scarlets some breathing space, but Ulster could have grabbed a try to win the game from a driving maul. They got up to the line, and looked set for the try, but Isaac Boss bumped into man of the match Neil Best, the ball went loose, and Gavin Thomas gleefully scooped it up to allow the home side to clear.
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