Cardiff's win was a follow-on from the 24-3 win at Rodney Parade earlier in the season, but Cardiff did lose centre Richard Jones with an injured ankle. However, they scored tries by wing Geraint Williams and big lock Luke Tait, younger brother of Canadian star John, who was involved in the Heineken Cup at Northampton.
Fly half Chris Anderson converted both tries and added three penalties and a drop goal, while Wales under-21 cap Hal Luscombe crossed for Newport and former Llandovery fly half Rhys Gosling converted.
Llanelli were on song to defeat Caerphilly by 52-12 with skipper Tal Selly leading the way with three tries, followed by Bryn Griffiths, Chris Rowe, Josh Freeman, Glyn Davies and Ceirin Jones with fly half Dan Smith goaling six of them. Caerphilly replied with two tries by David Reid, one converted by Michael Thomas.
Swansea gained a 23-7 home win over Bridgend with international centre Matthew Brayley, who recently appeared for Carmarthen Quins, scoring one try and lock Joe Purcell also went over with fly half Gareth James placing two conversions and three penalties. Bridgend's reply was a try by lively flanker Dan Fitzgerald, who has appeared for Tondu seniors this season and it was converted by a former Tondu back Lloyd Warner.
Neath also were home winners, defeating Pontypridd by 27-11 with fly half Peter Smriglia, the first player in senior rugby to reach 200 points this season, landing four penalty goals, but not converting the tries by prop Paul James, centre John Leyshon and replacement scrum half Gareth James. Treorchy fly half David Owen kicked a penalty and drop goal for Pontypridd and centre Matthew Nutall scored a try.
Ebbw Vale's Steelers Under-21 side played a friendly at Oakdale and won 20-14 in freezing conditions. Oakdale led 9-6 at the break after the Steelers scored with a Ross Watts penalty and a drop goal by Adam Sliczny. In the second half Oakdale scored a try tolead 14-6 before the Steelers wing Richard Jenkins turned the match by intercepting on his own line and running way for a try that Watts converted. Ebbw Vale then took the lead with a try by centre Matthew Griffiths that Watts again converted. Lock Damian Hudd was picked as man of the match.
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