Gilfach Goch's lead at the top of SWALEC Division Two East is down to just seven points after they crashed to a shock defeat at Mountain Ash.
The home side scored tries through scrum-half Meirion Thomas and lock Craig Locke, plus 10 points from the boot of fly-half Matthew Parfitt, as they beat their rivals and leapt to third place in the table with a 20-15 win.
Treorchy are now closing in on top spot after an easy victory at home to Ynysybwl, but missed out on the chance to narrow the gap further with their failure to secure the bonus point. The home side could only find the try line twice through Daniel John and Peter Hutchins as they sealed a 20-3 win.
Llantrisant almost certainly sealed their survival with a moral-boosting triumph at home to Garndiffaith. A Gareth Thomas double and one from Gavin Jones saw them cruise to a 28-8 victory.
Abergavenny are still well clear at the top of Division Three East, but they were pushed all the way by a spirited performance by lowly Gwernyfed. Hooker Craig Fuller scored for the home side but it wasn't enough as the league leaders hit back through wing Ian Davies and eight points from Dan Hayman's boot to scrape home, 13-5.
Fleur de Lys are still 12 points off the top after leaving it late to beat Tredegar Ironsides, but they do have four games in hand on the leaders. The Ironsides took a first half lead through a try by lock Lewis Jones.
But Fleur de Lys talisman Paul Emanuelli reduced the gap with a penalty, before knocking over another to win it 6-5 in the 70th minute.
Bottom side Cwmbran turned in a spectacular performance to demolish Blaina 45-19 and give their survival bid a glimmer of hope. Full-back Carl Moore and centre Gareth Roberts registered a double-apiece and Ian Hayes and Nicky Witts also crossed as Cwbran claimed the bonus point and closed the gap on the teams above them to eight points.
Elsewhere there was a shock 29-7 victory for Newport HSOB at Nelson and Rhymney kept up their promotion push with a 26-18 win at Croesyceiliog.
Angus O'Brien has quickly settled into the Wales Sevens squad after solid performances in Hong Kong and Japan. With two rounds remaining in Glasgow and Twickenham on the World Series, WRU TV's Graeme Gillespie chats to the rising star.
Wales winger Luke Morgan has established himself as one of the deadliest finishers on the Sevens World Series. WRU TV's Graeme Gillespie catches up with him on the eve of this weekend's round in Glasgow.
All roads lead to Cardiff on Sunday for the SSE SWALEC Finals Day at the Millennium Stadium. Cambrian Welfare tackle Ystradgynlais in the Bowl final, Ystrad Rhondda play Newcastle Emlyn in the Plate final while defending champions Pontypridd face Bridgend in the Cup final.
WRU Chief Executive Roger Lewis, Deputy Minister for Culture, Sport and Tourism Ken Skates and WRU Chairman Gareth Davies earlier this week launched a new competition in conjunction with the WRU unveiling its archive room.
Welsh players and management joined Deputy Minister for Sport Ken Skates at the Pierhead Building, Cardiff Bay earlier this week to reveal the Union's pioneering school-club hub initiative has been so successful the project will now almost double the scale of the original project.
The Scarlets, Newport Gwent Dragons, Cardiff Blues and the Ospreys look ahead to Judgement Day III which sees the Blues take on the Ospreys (2.30) and the Dragons tackle the Scarlets (4.45pm) at the Millennium Stadium tomorrow afternoon.
Ystradgynlais and Ynysddu played out a titanic struggle at Taffs Well in the SSE SWALEC Bowl semi-final. At the end of the game neither team could be separated after a 15-15 stalemate but Ystradgynlais go through on try count.
Blues strike first in JD III battle - Newport Gwent Dragons lock Andrew Coombs, WRU referee Dylan Llyr Jones and Cardiff Blues hooker Matthew Rees decide dressing room allocations for Judgement Day III
Wales Under 18 captain Calum Haggett has received a conditional offer to read Biomedical Science at St Anne's College, Oxford. WRU chairman Gareth Davies went to meet Calum and Coleg y Cymoedd Principal Judith Evans to wish him luck in his exams and pass on some of his personal experience.