Tredegar Ironsides were the team of the day in the Swalec Plate, claiming a terrific 31-8 win away at Rhymney, despite sitting a league below in Division Four East.
Jonathan Mills scored two of the away sides four tries and Ryan Hall claimed 11 points from the boot to seal a memorable win.
Risca of Division Four East put in a terrific performance to stun Croesyceiliog of Division Three East 20-15 away from home, while the students of Cardiff University pulled off another upset, beating Fairwater 17-14.
Rhydyfelin were the big scorers of the day, running home six tries on their way to a 41-0 demolition of Cilfyndd.
Mike Huckeridge claimed a try as Treherbert of Division Two East overcame a late scare to edge out Brecon 14-12, and
Tonyrefail came out in top of the all-Division Four East clash, beating Pentyrch 27-17 in a thrilling contest.
Elsewhere Mountain Ash beat Nelson 26-6, and Blaina claimed an impressive away win as they beat Division Three East rivals Abertillery Blaenau Gwent 20-8.
Abercarn pulled off the shock of the round in the Swalec Bowl, the Division Five East side beat Abergavenny of Division Two East 21-17.
Tries from Nicky Lloyd and Matthew Johnson had put Abercarn 13-12 ahead at half-time before Jack Davies put the home side 20-12 ahead. A late try from Abergavenny set up a tense finish, but the home side bravely held on to ensure a famous win.
John Mayler scored two tries as Old Penarthians gained an impressive 20-0 victory away at Canton and Ross Howells also claimed a brace as Ferndale beat Rhigos 20-8, Luke Rees claimed the other try for the Bulldogs.
Dowlais were the big scorers of the day as they ran in six tries to beat St Albans 45-3.
Crumlin put in a great performance away from home to beat Cefn Coed 34-0, while Usk also won away from home, they beat Llanhilleth 10-17.
Rhiwbina won 19-14 away at Cardiff HSOB, and Pontyclun also claimed a narrow win, beating Bridgend Sports 15-9. In the remaining game in the Swalec Bowl, Abervan failed to field a side against Newtown.
Whenever Bedlinog tackle Penallta a massive fixure is guaranteed but this Sunday there will be even more emphasis placed on the two rivals when they contest the SSE Swalec Plate final at Principality Stadium.
Ahead of their SSE SWALEC Bowl Final clash with Taffs Well at Principality Stadium on Sunday, Burry Port share their #FABXV nomination with WRUTV in the search for Welsh rugby's greatest volunteers. Everyone can get involved by sending nominations via twitter to @WRU_Community using the hashtag #FABXV
Cardiff Blues prop Gethin Jenkins and Ospreys centre Ben John look ahead to the first game at Principality Stadium in Saturday's double header which is promising to be a special occasion for all Welsh fans.
Carmarthen Quins Director of Rugby Ian Jones and committee member Jeff Thomas along with Llandovery chairman Handel Davies look ahead to Sunday's SSE SWALEC Cup showdown where both teams are out to prove 'West is best'
SWALEC ambassador Shane WIlliams is looking forward to Sunday's Finals Day where the Cup, Bowl and Plate offers a great opportunity for players and teams to experience the magic of playing at Principality Stadium
Carmarthen Quins coach Richard Kelly believes it is an exciting time to be part of the Scarlets region as his side take on local rivals Llandovery in the SSE Swalec Cup final on Sunday, as WRU TV's Graeme Gillespie discovers
Scarlets long serving prop Phil John talks to WRU TV's Graeme Gillespie about Judgement Day IV and SSE Swalec Cup finals day. The last time Llandovery were in the cup final in 2007, the Drovers claimed the spoils with Phil playing a major role in the engine room.
Meet Aberdare coach Luke Thomas whose #FABXV nomination goes to super volunteer Daz with a whopping 10 things he does for the club each week, all except the ironing! You can also join in the search for Welsh rugby's greatest volunteers, by sending your nomination via twitter to @WRU_Community using the hashtag #FABXV
SSE Swalec Cup kings Pontypridd travelled to Swansea, fully expecting a return to their second home but Llandovery had other ideas as they also sought victory in the semi-final to earn the right to play the final at Principality Stadium