Aled Thomas (with ball) secured a famous win for the Scarlets in Cork
The Scarlets' 13-6 away win to Munster was the highlight of what was a successful weekend for the Welsh regions in the RaboDirect PRO12.
Three of the four regions came out on top in their respective games with the Blues and the Dragons also securing wins.
The Ospreys were the only team to lose as a young side was narrowly beaten by Edinburgh.
With a number of players unavailable due to international fixtures and injuries, the last few weeks have seen the regional coaches give youth its chance. A lack of experience did not seem to matter for the Scarlets though as they claimed a famous win in what were appalling conditions in Cork.
With the rain and wind against them in the first half, Simon Easterby's side repelled wave after wave of Munster attack and Aled Thomas exchanged penalties with Ian Keatley as the sides went in level at the break.
Thomas added a second penalty after half time before Andrew Fenby's decisive score secured a historic win for the Welsh side. The win sees the Scarlets in second place ahead of a clash with league leaders Ulster at Parc y Scarlets next Sunday.
In Italy, Cardiff Blues got back to winning ways with a 7-14 win over bottom club Zebre. A try from prop Nathan Trevett and three penalties from the boot of fly-half Ceri Sweeney were enough to secure a win for Phil Davies' side.
The victory at the Stadio XXV Aprile sees the Blues move into ninth, one place and four points behind the Ospreys.
Despite defeat to Edinburgh at Murrayfield, a young Ospreys side showed the depth of talent available in the region with Matthew Morgan impressing at outside half.
Morgan scored all of the points for Steve Tandy's men including a try, a conversion and two penalties as his side raced into a 13-8 half time lead.
Sadly for the Ospreys youngsters, they were unable to hold on as the boot of Greg Hunter and WP Nel's try saw Edinburgh turn the tables.
In another fiercely competitive game at Rodney Parade, a Pat Leach try saw the Dragons secure their first PRO12 win since September.
Full back Tom Prydie kicked added three penalties as his side saw off Connacht for a much needed win.
The Women's Rugby World Cup warm-up clash between Wales and USA proved bittersweet for centre Elen Evans. Despite being one of the star performers on the day on her 50th Test appearance, USA edged home 10-7 at Cross Keys.
Wales U20 head coach Byron Hayward and back row Will Boyde believe defence will be the key when they face Ireland tomorrow in the second pool game of the Junior World Championship being held in New Zealand.
Tension was palpable as players waited to hear the announcment of the Wales touring squad of South Africa. Matthew Morgan was one of four uncapped players named in the squad after impressing in the Wales Senior Trial.
Wales Trial, Principality Premiership Awards evening and Wales U20s in this week's Principality Welsh Rugby Union Podcast. We hear from Jamie Roberts and Matthew Rees about the Wales Trial, captain Dafydd Lockyer talks about Pontypridd dominating the Principality Premiership awards, while ahead of the start of the Junior World Championships we talk to Tom Williams, Steffan Hughes, Jack Dixon and Nicky Smith.
Coaches Rob Howley and Robin McBryde today confirmed their Probables and Possibles teams to take part in Friday's Wales Senior Trial at the Liberty Stadium and both are predicting some mouth-watering head-to-heads.
Possibles coach Robin McBryde has given his team a licence to thrill in Friday's Wales Senior Trial match. He tells WRU TV's Graeme Gillespie that his side will be determined to ruffle a few feathers against the favourites, the Probables.
We look at the squads for the Wales trial, European finals weekend and Wales U20 on this week's Principality Welsh Rugby Union Podcast. We hear from Warren Gatland and Rob Howley on the trial, full back Hallam Amos on his summer hopes, Wales legend Ieuan Evans welcomes European rugby finals weekend to Cardiff and Wales U20 hooker Ethan Lewis looks ahead to the Junior World Championships.
Wales Under 20 head coach Byron Hayward says last night's 31-19 win over Scotland was a crucial building block as the Junior World Cup rapidly approaches. WRU TV's Liz Jones gets his post match reaction.