Glynneath captured the Silver Ball from last season's winners Maesteg Quins with a splendid second-half comeback after being 10-0 down at the interval, to come away with a 13-10 victory.
It was the first time in 49 years that Glynneath had won the coveted trophy, having won in 1961, 1962 and 1963.
The Quins battled hard to hold on and after an even first 29 minutes, Quins captain and fly half Gareth Lewis laned a penalty and the the first try came seven minutes later.
Glynneath full back David Evans was caught and Quins centre Ryan Lovett beat off defenders to score with Lewis converting.
In the second half, Glynneath used the strong wind well, particularly through their young fly half Jack O'Reilly.
It was O'Reilly's clever coss-kick that sent wing Jonny Morgan over after 47 minutes and O'Reilly added the conversion. After 62 minutes, Glynneath were awarded a penalty but as referee Gwyn Morris played advantage, O'Reilly dropped a smart goal.
Glynneath centre Kyle Roberts was unlucky to be red-carded for a second bookable offence, but 14-man Glynneath won it when O'Reilly placed a penalty with eight minutes remaining.
The man of the match award was made by former international referee Cliver Norling who selected the young Glynneath lock Lloyd Bayliss.
The Silver Ball was presented to Glynneath centre and captain Greg Roberts by Mr. Richard Davies, Accounts Manager of Molson Coors.
Maesteg Quins Try: R Lovett. Con: G Lewis. Pen: G Lewis.
Glynneath Try: J Morgan. Con: J O'Reilly. Pen: J O'Reilly. DG: J O'Reilly.
UEFA has today confirmed the Football Association of Wales (FAW) has been successful in its bid for the Millennium Stadium to host the 2017 UEFA Champions League Final on Saturday 3rd June, 2017 (kick-off: 19.45hrs GMT).
The winners of a filmmaking competition organised by the education charity Into Film and the WRU enjoyed a behind the scenes tour of the Millennium Stadium - and a chance to be photographed with the WRU's fire-breathing, rugby loving mascot, Scorch The Dragon, and Welsh international, Jake Ball.
The Wales Under 20 camp are in a quietly confident mood as they face Ireland in the U20 Championship, with Coaching Co-Ordinator Allan Lewis and full back Dafydd Howells targeting a top five finish in the tournament.
Wales U20 may start as favourites against Japan this evening in the U20 Championship, but Team Manager Mark Taylor is warning against complacency. He is also hoping a good win will boost morale and 'kickstart' performances.
Coach Richard Hodges is hoping Wales U20 can put a disappointing campaign behind them when they tackle Japan tomorrow as they look to finish the U20 Championship strongly to secure a good seeding for next year's tournament.