The Ospreys made hard work of their 14th straight win over Welsh opposition as Newport Gwent Dragons were defeated 20-10.
Cardiff Blues kept alive their faint hopes of securing a place in next season's new-look European Cup with a 17-13 success over Scarlets.
Swansea City Manager Garry Monk says there are "no problems" at Swansea after "a couple of incidents" in training recently.
Newport County drew 1-1 with Burton at Rodney Parade.
Andy Sandell gave Newport County the lead after five minutes, but Michael Symes equalised for the visitors. Newport 1-1 Burton (HT)
Wrexham are trailing at half time in their conference clash against Lincoln after a goal from Danny Rowe. Wrexham 0-1 Lincoln (HT)
HT: 0-1. Not a great spectacle as the Reds trail to Rowe's 31st minute goal.
The Ospreys have triumphed against the Dragons this evening in the second of the 'Judgement Day' derbies.
Final score: Dragons 10 - 20 Ospreys, with tries by Richie Rees and Tom Habberfield.
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.
An injury-time penalty from Wilfried Bony sealed the win for Swansea over Newcastle yesterday. Bony's double gave the Swans their second league win in the past 10 games.
Read more at ITV Sport.