All 4 Welsh regions are in Pro 12 action at the Principality Stadium
It's a day of Welsh derbies at Cardiff's Principality Stadium.
First up, the Ospreys face the Blues the later in the afternoon the Scarlets take on the Dragons in the Pro 12 double header.
With Ospreys sitting third and Scarlets 4th in the table, there is a lot at stake in the next few matches.
Ospreys Head Coach, Steve Tandy, commented:"It's the business end of the season now and we know what's at stake over the next few weeks. We've got three big games, three tough challenges ahead, starting with the Blues at Principality Stadium and we know what we've got to do.
"We are in third place so we can take comfort that it's very much about us in the run-in, if we put together three winning performances then there's nothing anyone else can do to stop us reaching the play-offs.
"Things haven't gone as planned the last few and, where we had a bit of a gap, some room for comfort, Ulster and the Scarlets are breathing down our neck and will both be desperate to put one over us in the final two rounds.
"There'll be a lot of fuss around Saturday's game, a derby match at the Principality Stadium in front of a big crowd, but we can't allow ourselves to get wrapped up in the occasion. It's important that we are professional around the build up and the 80 minutes itself.
"That has to be the focus for us, to build a performance of the level required from first to last minute and make sure we can keep ourselves ahead of the chasers for the last two rounds.
"The Blues are a dangerous side, they have threats across the field, and can score tries from anywhere on the field so we've got to be at our best.
"The last two weekends have been frustrating for us, both games that we could have won, we don't want the same story this week and it's only the players out there who can control that by their actions and decision making when they step over the line on Saturday."
Meanwhile, Scarlets head coach Wayne Pivac has named 9 internationals in his side for this afternoon's encounter.
Jonathan Davies returns to centre fellow international Scott Williams in the centre with Liam Williams also making a return to the starting XV.
The all-international front row of Rob Evans, Ken Owens and Samson Lee retain their places whilst Tadhg Beirne takes his place on the blindside flank with Aaron Shingler unavailable due to injury.
Werner Kruger has recovered from illness and is named on the replacements bench whilst David Bulbring will look to make his first regional appearance since November following surgery to a shoulder injury.
Speaking ahead of the Judgement Day clash Pivac said; "We had a pretty good day at the office last week against Treviso securing a bonus point victory. It'll be an interesting challenge against the Dragons.
"You can see the disappointment in the players eyes who haven't been selected. Everybody in the squad is looking forward to being there. Hopefully we can put in a good performance that warrants such an occasion.
"We know what we've got coming up, we know what our opponents have got coming up; certainly there are some intriguing matches.
"Our focus is what we can control. What we can control is an 80 minute performance against the Dragons and if we can play to our potential hopefully we can get some points out of this game which will keep us headed in the right direction to the top four.
"We're not going to underestimate them, they're playing for the same reasons that we are; the big occasion, selectors will be there, there's everything to play for.
"There are bragging rights up for grabs, it's a derby. We're expecting a ferocious twenty minutes to start with and we're hoping we can come out on the right side.
"There's a lot to play for and it starts with a good performance against the Dragons this weekend."