Scarlets lock Dominic Day made sure Llanelli held onto pole position in the Principality Premiership.
Day crashed put the league leaders on course for a 27-23 victory over Aberavon with the game's first try.
Luke Richards added the conversion and penalty but Llanelli had to come from behind after trhe second-placed Wizards led 16-10 at the break through Richard Thomas and Jamie Davies.
Matthew Jacobs and Craig Shingler scored the tries that kept Stradey Park on song.
Neath motored into second place with an emphatic 62-20 win over Cross keys thanks to a second half rout at the Gnoll.
Newport romped to to a ten-try win over lowly Llandovery. Newport Gwent Dragons youngsters Jason Tovey and Gethin Robinson weighed in with tries as the Black and Ambers cruised to a 67-5 win at Rodney Parade.
Swansea failed to build on a promising first half and missed out on a bonus point in a 23-15 win over Bedwas.
Wales Sevens ace Jason Lewis brought Pontypridd crashing at Ebbw Vale, 13-3, and Geraint O'Driscoll's 26-point haul was not enough to save Pontypool from a 42-31 loss at Glamorgan Wanderers.
The last five years have been an emotional rollercoaster on and off the pitch for RGC1404. Promotion to the Principality Premiership was the culmination of five years of hard work and investment in North Wales. WRU TV caught up with prop Joe Simpson, who was one of the first intake of WRU North Wales Academy players in 2010.
Ebbw Vale captain Damien Hudd picked up the biggest accolade of the night at the 11th Principality Premiership Awards Evening held at Principality Stadium, after leading his side to the title for the first time.
Wales assistant coach Robin McBryde is predicting a tough battle against England on Sunday despite the fact they may not be considered to be at full strength. Players will be out to impress Eddie Jones which makes England a dangerous proposition, he says.
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