Judgement Day double-header from the Principality Stadium in Cardiff.
Ospreys 19-36 Cardiff: Keiran Williams try puts Ospreys ahead, before Alex Mann and Gabriel Hamer-Webb doubles give Cardiff handy half-time lead. Ospreys' Will Spencer and Kieran Hardy narrow gap, but late penalty try and Hamer-Webb's hat-trick seal Cardiff win.
Dragons 23-31 Scarlets: Henry Thomas try opens scoring for Scarlets, with Jared Rosser replying for Dragons. Ashton Hewitt and fellow Dragons wing Rosser cross in quick succession after the break, but Alec Hepburn, Vaea Fifita and Blair Murray claim tries for Scarlets.
Cardiff lift the Welsh Shield as top dog in games between the four Welsh regions during the United Rugby Championship season.
Live Reporting
Matt Lloyd and Ceri Coleman-Phillips
Postpublished at 16:07 British Summer Time 19 April
16:07 BST 19 April
Ospreys 7-22 Cardiff
Sean Holley Former Ospreys head coach on BBC One Wales
This is where the best players step up. It’s so easy for Cardiff today.
Postpublished at 15:57 British Summer Time 19 April
15:57 BST 19 April
HT: Ospreys 7-22 Cardiff
Gareth Griffiths BBC Sport Wales at Principality Stadium
Cardiff were in complete control of that first half with a bonus-point fourth try inside 35 minutes. Three missed conversions has seen the scoreline flatter the Ospreys.
Mark Jones' side are missing key injured forwards Justin Tipuric, Rhys Davies, Adam Beard and Morgan Morris, and that has told in the opening 40 minutes.
The wing has a second in the space of eight minutes.
Ben Donnell broke clear of a maul in midfield but the big lock knew he would never have the legs to go all the way.
He does well to find Hamer-Webb who beats Reuben Morgan-Williams and just manages to ride a tap tackle by Jack Walsh before wrestling with Morgan Morse to touch down over the line.
Suddenly Cardiff are in control despite a second missed conversion.