It's Dragons 0-0 Ospreys at half-time in the second of the 'Judgement Day' derbies. Ospreys's Ryan Jones was given a yellow card for killing the ball.
Judgement Day's first derby has ended Cardiff Blues 17-13 Llanelli Scarlets.
Two yellow cards saw Liam Williams sent off for the Scarlets and a straight red for the Blues's Robin Copeland saw him sent to the stands, leaving both teams down to 14 men in the second half.
It's a second yellow for @sanjaywills and a red for Copeland. Both teams down to 14 men at 55 minutes.
Alex Cuthbert's try and nine points from Gareth Davies's boot have given Cardiff Blues the lead against the Scarlets at half time in the first derby of the day. Rhys Priestland gave the Scarlets their first half points on the scoreboard. Half time - Cardiff Blues 14-8 Llanelli Scarlets.
One of the biggest fixtures in the Welsh regional rugby calendar kicks off later, as 'Judgement Day II' sees the Cardiff Blues take on the Scarlets and Newport Gwent Dragons face the Ospreys at the Millennium Stadium.
With the RaboDirect PRO12 season finale edging closer and both European seeding and derby pride at stake, there is plenty riding on the two contests at the home of Welsh rugby.
The day kicks off at 2pm with 9th placed Cardiff Blues against the Scarlets, who lie three places above them in the PRO12 table in 6th.
The Blues have triumphed in their last two PRO12 matches but have failed to win three in a row since November 2011.
The Scarlets have won on both of their previous visits to the Millennium Stadium, beating Bath in the Anglo-Welsh semi-final in 2006, before emerging victorious against the Dragons in last season's 'Judgement Day' double header.
In the day's second fixture at 4.45pm, Newport Gwent Dragons, who lie 10th in the PRO12 table, take on the Ospreys - the highest placed Welsh region in 5th.
The Dragons are without a win in their last five matches since their defeat to Glasgow at Rodney Parade in February.
As for the Ospreys, they are enjoying better form going into today's contest having won two of their last three matches. They have also been victorious in their last 13 PRO12 encounters against fellow Welsh regions.
The Dragons lost their home RaboDirect Pro12 match to Edinburgh this evening. Tries by prop Willem Nel and centre Matt Scott gave the visitors a commanding lead.
Ross Wardle's late score wasn't enough to save the day for the Dragons.
The Scarlets have withstood a late Connacht fightback to get a bonus point win in the Pro12 this afternoon. Tries from Jonathan Davies and Josh Turnbull, and two touchdowns from Gareth Davies and helped seal the victory.
Two tries from Jeff Hassler were not enough for the Ospreys as they were beaten 31-25 in Edinburgh.
The visitors had an early lead after the first of Hassler's tries.
But the home side responded, as Grayson Hart crossed the line twice, with Sam Beard also adding five points to Edinburgh's tally.
The Ospreys almost managed a remarkable second half comeback, after Hassler's second try put them within three points.
The Welsh side did manage a losing bonus point however towards their push for a play-off place.
The Newport Gwent Dragons endured a crushing defeat at the hands of Ulster, after two tries from Tommy Bowe and another from Ruan Pienaar helped the home side secure a 38-8 win at Ravenhill.
Ross Wardle crossed over the line in the 63rd minute to score the Dragons' only try of the match.
Cardiff Blues suffered a 54-13 defeat away at Munster last night in the RaboDirect PRO12.
The home side's six-try victory gave them their biggest win of the season.
The Blues were only 19-13 behind at the break, but a run of tries from Simon Zebo and Gerhard van den Heever, coupled with a penalty try put the hosts in full control.