Blackwood are the new leaders of SWALEC Division One East after a comprehensive 43-13 win away at the students of UWIC.
Brothers David and Trevor James got two of the away side's five tries with Mark Birkby, Gareth Busby-Davies and Gareth Price, who also claimed 20 points from the boot, completing the rout.
They climb to the top at the expense of faltering Newbridge who slipped to a shock 32-24 defeat against bottom side Newport Saracens.
Two tries from Nathan Powell and one from wing Wesley Cunliff had helped the Saracens to a 22-10 half-time lead.
Newbridge came back stronger in the second-half with tries from Richard Powell and Gary Wilks but a second try from
Powell, sealed a surprise win to lift Newport off the bottom of the table.
Penalta are now the new side at the bottom of Division One East after a narrow 22-28 defeat to Llanharan.
In the remaining game of the day in Division One East Ystrad Rhonnda took a big step towards the safety of mid-table with an emphatic 41-8 win away at Bargoed.
Tredegar stay top of Division Two East after their 20-13 win against Bedlinog. Dafydd James and David Ford got the tries.
Abergavenny were the big scorers of the day in Division Two East as they ran in four tries to demolish Abergavenny 29-15.
Pill Harriers are chasing down the leaders in Division Three East, as they romped to a 37-5 win over Pontypool United, with two tries from Leighton Burrow.
Strugglers Abertillery pulled off the shock of the day beating high-flyers Croesyceiliog 29-5. With neither of the top two playing third-placed St Peters took full advantage in Division Three South East with a 24-6 win over Penarth.
Monmouth were the big scorers in Division Four East as they trounced Chepstow 30-10, and Heol Y Cyw maintained their stranglehold on Division Four South East with a narrow 13-8 win against Llantwit Major.
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