CWMAMMAN United saw the game slip away late in the second half as Treharris mounted a strong comeback.
The Blues will feel that if they had converted some of the chances they created it could have been a different result.
They started so well with Charlie Davies and Ross Morgan immediately taking control of the midfield and they had the perfect foundation when Keiran Richards clinically converted the first main chance to take the lead in the 9th minute.
Cwm continued to have the upper hand throughout the first half. In the 15th a fluid team move saw Scott Jewell hit the bar from close range with the ball coming down on to the line but Cwm could just not get to it and finish it off.
Grant Rees and Ronan Templeton were solid at the heart of the defence and Treharris opportunities were limited but In the 28th minute however Kai Rees was called upon to make a great save.
Cwm were then hit with a double blow just before half time when Rees had an injury that hampered his movement for the rest of the match while Davies who was so influential in midfield had to leave the field. This proved to be key changing the nature of the game.
The second half saw a more open game with both sides now creating chances. Then in the 60th minute a quick break and long ball over the Cwm defence saw Sam Cawley race through to slot it past Rees.
Things got worse in the 70th minute when a long free kick floated to the back post allowed Matt Sellick to nip in and head home.
Cwm went frantically looking for the equaliser with wing backs Leon Croucher and Cory Saunders launching many Cwm attacks and Ross Morgan prompting the side from the middle.
They saw a Calem Rees shot drift inches past the post while substitute Jordan Sullivan could just not get his shot away in front of goal.
There were then two strong penalty shouts as Kyle Ashford who was causing the Treharris defence all sorts of issues was brought down as he beat a man near the goal line by line followed by a strong hand ball shout.
In the 96th minute as Cwm peppered the Teharris defence a long high ball caused some confusion and the ball fell to Haben Samson who closed the game off at 3-1.
Cwm now travel to the Swansea University field on Friday evening to play Mumbles Rangers at 7.30pm.
