In SWALEC Division Two East, Mountain Ash closed the gap on league leaders, Gilfach Goch, thanks to a 33-21 win over fourth-placed Brynmawr.
The vital win on the road keeps them in the hunt for promotion. Brynmawr stuck with three tries but it was not enough to overcome the visitors, who scored tries through Merion Thomas, Craig Evans, Dale Keeping and Dean Philips to secure maximum points.
Treorchy also kept their chances alive with a bonus-point home victory over Penallta, Shaun Green, Damon Filmer, Andrew Mallin and Peter Hutchings the men who crossed for the hosts.
However Gilfach Goch, who were not in action this weekend, can win the title and promotion to Division One East with a bonus-point win in a crunch match against Treorchy on Friday.
Elsewhere in the division, Llanharan secured their place in the league for another year with a hard-fought victory over Llantwit Fardre.
Fleur De Lys will join Llanharan in the division next year after they were crowed Division Three East champions, recording a 29-17 win over Gwernyfed on the road. Back-row duo Leigh Taylor and Lee Jones were joined by Jamie Heythorn to touch-down and Paul Emanuelli slotted a further 14 points.
Meanwhile Pill Harriers ran in nine tries on their way to a 61-7 triumph over Croesyceillog. Ross Palmer was in magnificent form and the fly-half inspired the Harriers to victory with a five-try brace.
In a titanic battle in Division Four East that saw league leaders Abertillery BG travel to second-placed Risca. The visitors came out on top and took a giant leap towards securing the Championship thanks to a closely fought 18-13 win. Wing Aled Penn proved the difference and raced away to score two vital tries.
League strugglers, St Josephs, scrapped to a crucial win in their battle to avoid the drop, securing 15-13 win at Abercarn, Nigel Morgan and Ryan Moore the try scorers for St Jo's.
Wales U20 captain Tom Phillips and performance psychologist Dr Rich Neil explain why spending three days at Monmouth RFC has further strengthened the togetherness of the squad ahead of the #WorldRugbyU20s
Alongside Scarlets flanker James Davies and Cardiff Blues centre Cory Allen, three Wales Sevens core players have made the extended training squad for GB Sevens. Wales Head coach Gareth Williams tells WRU TV's Graeme Gillespie why Luke Treharne, Sam Cross and Luke Morgan earned selection in the initial training squad for Rio.
Wales Sevens head coach Gareth Williams tells WRU TV's Graeme Gillespie he has had to overcome a number of injuries before naming a competitive squad for this weekend's penultimate round of the World Series in Paris.
Merthyr were officially crowned champions of the SSE SWALEC Championship at Dowlais on Saturday where captain Andy Powell paid tribute to his side who have earned promotion to the Principality Premiership
Coleg y Cymoedd's season has had a spectacular ending with victory in two cup finals and a massive victory over one of the best rugby playing schools in the world - Welsh coach Warren Gatland's old alma mater, Hamilton Boys' High School.
WRU chief executive Martyn Phillips hosted the second meeting of the WRU Youth Board last weekend ahead of the Judgement Day IV regional double-header. Tthe board, made up of 15 under-21-year-olds from around Wales, heard presentations from head of participation Ryan Jones, policy and integrity manager Jeremy Rogers and national women's rugby manager Caroline Spanton, with Pro Rugby Wales CEO Mark Davies also on hand to hear the range of views aired.
Wales duo Rhun Williams and Liam Belcher, who makes a welcome return after five months of injury woe, look ahead to next month's World Rugby U20 Championship in Manchester where they will face Ireland, Georgia and New Zealand.