Corus recorded their fifth straight win with a 29-22 result in an entertaining, seven-try match against Kidwelly. Lewis scored two tries and kicked nine points as the league leaders kept their noses ahead of Dunvant, who made it four out of four with an impressive 30-3 win at Carmarthen Athletic.
Gorseinon were the only other team who went into Saturday's games with an unbeaten record, but Bridgend Athletic took care of that with a well-deserved 20-13 win at home.
Seven Sisters fullback Kevin Lewis kicked four penalty goals as his side edged past Felinfoel 22-14 to record their second victory of the season. Loughor fullback Lee Davis matched Lewis' feat, his four goals providing all of his side's points in their 12-10 win at winless Banwen, while Maesteg Quins beat Tonmawr 17-3 and Pontyberem accounted for Mumbles 20-12.
Trimsaran and Haverfordwest are locked together at the top of Division 3 West, although Haverfordwest did it the hard way with an 18-16 win at winless Lampeter. Trimsaran cruised to a comfortable 27-3 victory over Newcastle Emlyn.
At the wrong end of the table, Tumble (35-19 losers to Aberystwyth), Lampeter and Hendy (18-5 losers to Tenby) are still looking to lose the duck's egg beside their names.
In Division 4 West, Pontarddulais continue on their merry way at the top after a 37-6 win at Cardigan, while second-placed Neyland were held to a 13-all draw at Milford. There was another draw in the division, with bottom-placed Llandybie earning their first point of the season courtesy of a 6-all deadlock at home to mid-table Ammanford.
Llanybydder are alone at the top of Division 5 West after their fifth straight victory - a 49-0 mauling of Pontyates - although Burry Port also retained unbeaten with a gritty 22-18 victory at Tycroes.
Pontyates are one of three sides still looking for their first win. The two Saints - David and Clears - are holding up the table after St Davids fans had to sit through a 57-6 hammering at the hands of Gowerton and St Clears fell 16-36 at home to a Llangwm side celebrating their first win of the season.
The Half a Game initiative is currently sweeping across Wales and proving a major success. The scheme aims to give every young player at least half a game every weekend. WRU TV recently visited a festival in Narberth where clubs have fully embraced the initiative.
Both Bargoed and Swansea were seeking their first win of the Principality Premiership season this afternoon. It proved a fruitful day for the hosts - not only did they win, but Bargoed claimed a try bonus point.
Cardiff managed to keep their unbeaten record at home intact, but only just as Bridgend made them work extremely hard before the Blue and Blacks secured a hard fought Principality Premiership win at the BT Sport Arms Park last night.
Former Wales back row Andy Powell gives a guided tour of The Wern, home of Merthyr RFC, who are determined to prove a lot of people wrong and make their mark in their first season in the Principality Premiership.
Wales Sevens head coach Gareth Williams looks back on the Rio Sevens success where he helped GB win silver. He believes the successful campaign is a huge boost to his Welsh squad as they prepare for another World Series, as WRU TV's Graeme Gillespie discovers
British and Irish Lions head coach Warren Gatland will be heading back home to take on the All Blacks next year where for him, success for 2017 is all about going to New Zealand and winning a Test Series.
Last week all roads led to Eugene Cross Park where defending champions Ebbw Vale hosted this season's launch of the Principality Premiership. WRU TV's Graeme Gillespie was there to capture the thoughts of Damien Hudd, captain of Ebbw Vale, and WRU Head of Performance, Geraint John.
Llandovery made it three in a row when they defeated Aberavon in the final of the National Foster's 7s at BT Sport Cardiff Arms Park on Sunday. On another eventful day of sevens, Newport claimed the Plate and the Dragons won the women's crown
Last week saw Cardiff welcome players from around the world for the 21st Golden Oldies Festival. The tournament features players over 35 years of age, and this year's event saw a select few represent the WRU in a 'friendly' against the Wooden Spoon.
Wales Under 18 captain Callum Bradbury is delighted to have seen his side claim a narrow 18-17 victory against a strong SA Schools 'A' side to end the three-match Under 19 International Series in South Africa on a high note.