Blues boss Dai Young knows that the hard work his side have put in since their painful defeat to Toulouse last year has paid off.
The Blues boss watched nervously from the Millennium Stadium touchline as his troops dug deep to complete a nine-six win over the most decorated side in European rugby history.
But nerves were gone in the post match press conference, and young hailed his growing team. "The players have improved game on game, season on season.
"We have been moving forward over the past two-to three years and its al culminated in this result.
"It was a great day both on and off the field. We made life difficult for ourselves but we got the result, and a place in the semi-final
Not only have the Blues impressed on the park, they have impressed off it. A second trip to the Millennium Stadium awaits them, and, in light of the record home crowd of 36,728 they pulled for today's game, Young and co. won't be too worried about rattling around in one of the largest stadium's around.
And the coach paid tribute to the progress his side have made. He said; "For a Welsh team attendance to day is a great measure on how far the team has come in the past few years a measure of interest
"From the regions' point of view it's a great day and a great experience."
Beating Merthyr has boosted Carmarthen Quins hopes of reaching a top eight spot in the Principality Premiership. Quins captain Haydn Pugh is delighted with his team's progress and is determined that everyone from the Under 6s through to the senior team, enjoys the ride.
When the Wales squad were asked to nominate individuals who played a big part in their early playing days, Wales and Dragons full back and wing Hallam Amos thought of his former Monmouth School rugby coach John Bevan.
Sam Cross and Luke Treharne have been named as co-captains of the Wales Sevens side as head coach Gareth Williams names his 12-man squad to play in the first leg of the HSBC World Series in Dubai next weekend.
Bedwas head coach Steve Law and players Nicky Griffiths and Alun Rees extol the virtues of the close knit club as they prepare to host third place RGC 1404 - who are one place head of them on the Principality Premiership points table - on Saturday.
Many of the Wales squad have said Diolch (thank you) to someone who played an important part in their early playing days by nominating them to be invited to the Wales v South Africa match. One person, Gowerton Comprehensive geography teacher Mr Dean Mason was nominated by two of his former pupils, Dan Biggar and Sam Davies.
The second WRU disability rugby pilot has been delivered, this time in Caerphilly schools, culminating in a festival at the Caerphilly Centre of Sporting Excellence, Ystrad Mynach tomorrow. Plans are in place to set up a Disability Rugby Club in Newbridge to provide long-term playing opportunities.
WRU TV: Hear from inside the Wales camp as Neil Jenkins discusses this weekend's clash with South Africa and how the squad are looking to put in a strong performance to round of the 2016 Under Armour Series