Dunvant were denied their first win of the season by a controversial injury-time try for Felinfoel.
The basement Division One West side had lost their previous 21 league matches this season. But they looked certain to break their duck before Luke Marsh touched down to secure a narrow 31-27 victory.
It was scrum-half Marsh's second score of the afternoon but the hosts claimed the ball had not reached the try-line.
Sam Crowley, Mike Arnold and Lee Tucker crossed for Dunvant but Felinfoel had already scored tries through centre Ryan Nicholls, fly-half Stuart Wall and former Dunvant player Simon Delaney.
Second-placed Tonmawr gained a bonus-point 33-10 away win at third-placed Narberth with wing Ryan Davies grabbing a double to assist Hywel Davies, Steve Lewis and Mickey Evans.
Cwmllynfell beat Carmarthen Athletic 34-22 and Whitland and Bonymaen shared the spoils in a 15-15 draw. Carwyn Jones scored all the points for the hosts with tries from Robbie Ford and Duane Eager.
Division One East Champions Blackwood hammered Caerphilly 86-24 thanks to hat-tricks from the James brothers. Both Trevor and David James crossed three times each in an 11-try blitz against the fifth-placed outfit.
Luke Knight added two tries while Mark Birkley and Adam Coupe completing the scoring while the home side scored consolation touch downs through James Walby, Keiran Phillips and fly-half Dan Ellis who claimed 14 points.
It was a try-scoring feast across the three games played in the division with UWIC running in eight tries in their 49-15 romp over Merthyr.
Bargoed moved into fourth place in the table with a convincing 29-15 victory over Rumney. The hosts raced into a 24-5 interval lead with wing Gary Jones grabbing a double along with Rhys Humphreys, Lewis Wayman and Danny Jones.
Roger Lewis talks to WRU TV at the announcement of a new £60 million Rugby Services Agreement (RSA) which provides a new and positive contractual relationship between the WRU and its four Regions for the next six years has been agreed.
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Having taken part in seven World Cups as a player and coach, Liza Burgess hopes to go out in style this afternoon when Wales take on Australia in the Play-off for seventh and eighth place in the Women's Rugby World Cup in Paris.
WRU Head of Rugby Josh Lewsey met with volunteers across the game earlier this week, championing their role in the sport. He was joined by Wales captain Sam Warburton for part of the day as volunteers took part in a 'Try Out' event for the 2015 Rugby World Cup
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Two weeks into the new pitch project at Millennium Stadium, Groundman Craig Campbell takes staff on a unique behind-the-scene tour of the works so far and National Squad Assistant Strength and Conditioning Coach John Ashby and Tour Guide Peter Owen describe what the revamp means for them.
Try-scorer Jenny Davies and fellow prop Megan York reveal to WRU TV's Graeme Gillespie their thoughts after Wales broke their drought in the Women's Rugby World Cup with a 35-3 win over South Africa in Paris.