Bonymaen shocked Carmarthen Athletic to win 14-13 at Five Fields and move off the bottom of Division One West.
Winger Robert Jones scored Bonymaen's only try, with Richard Cunniffe kicking their other nine points with two penalties and a drop goal.
Town rivals Carmarthen Quins faired much better, winning 32-6 at Cwmllynfell to extend their unbeaten run and remain top of the table.
In light of Bonymaen's win, Dunvant are now eight points adrift at the foot of the table following their 75-0 thrashing at second-place Tonmawr.
The Pitmen ran in 13 tries, with Ryan Baylis standing out as their hat-trick hero. He crossed three times during an emphatic victory, with Ben Davies going over twice as one of nine other Tonmawr try-scorers.
Whitland moved third after beating Llangennech 45-3, posting six tries including two for Lee Glanville.
Corus ran in four tries to beat Narberth 34-10, with full-back Rhys Williams kicking 11 points for the Steelmen. Felinfoel change places with Maesteg in sixth after they won 19-18 at Llynfi Road.
Merthyr stay top of Division One East with a predictable sixth victory of the camapign at bottom side Newport Saracens, who remain without a win so far this season. Full-back Adam Williams scored two of his team's six tries in the comfortable 43-7 win.
Newbridge remain second following their 33-16 success against Llanharan following two tries from Ceri Young.
Bargoed racked up a bonus point in their impressive 30-5 away win at Penallta keeping them hot on the trail of the top two.
Beddau lifted themselves clear of relegation with a 41-16 victory over Rumney. Matthew Evans scored two tries for Beaddau, the others came from Slater, Cleverly and Adams while Rhys Truelove racked up an impressive 16 points from the boot.
Gareth Price kicked three penalties to secure a 14-10 win for Blackwood over strugglers Ystrad Rhondda while Uwic scored four tries to beat Caerhilly 29-23 in a thrilling game at Virginia Park. Uwic held a convincing 17-5 lead at half-time but were left holding on at the end thanks to some reliable kicking from the boot of Colin Ashton.
The WRU has launched a campaign to create a long term legacy for Welsh club rugby by highlighting the advantages of volunteering. Rhian Edwards, a volunteer at Seven Sisters, has enjoyed many benefits of her volunteering at a grassroots rugby club including being part of the Rugby World Cup volunteer workforce after being nominated by the WRU - and the WRU is asking for more people to develop their 'Welsh rugby roots'.
Wales head coach Warren Gatland and captain Sam Warburton say their first prioirty on Sunday in the opening game of the World Cup is to win against Uruguay and not get overly concerned with points difference.
With only days to go until the biggest rugby competition in the world begins, rugby fans visiting Cardiff this autumn will be able to enjoy a special display at National Museum Cardiff as part of the celebrations surrounding the Rugby World Cup.
Geraint John has taken up the new role of WRU elite coach development manager having arrived in Wales last week. WRU TV caught up with him at the WRU rugby department's strategy day at the Millennium Stadium.
The entire Welsh Rugby Union Rugby Department gathered at the Millennium Stadium earlier this week where WRU Head of Rugby Josh Lewsey looked back on a year where structural and strategic changes have seen significant progress made
The Welsh Rugby Union has released a specially produced video to spearhead a new campaign to help promote the values of rugby union. The video, entitled Let us Play underpins the WRU rugby department's philosophy - to engage, transfer and retain players, coaches and referees.