Scarlets v Ospreys (15:00 BST) - BBC Radio Wales & BBC Radio Cymru
Dragons v Blues (17:15 BST) - BBC Radio 5 live sports extra, BBC Radio Wales & BBC Radio Cymru
Here are today's officials at Rodney Parade:
Referee: Ian Davies (WRU)
Assistant referees: Gwyn Morris, Gareth Newman (WRU)
TMO: Sean Brickell (WRU)
Image source, Huw Evans Picture Agency
Image source, BBC Sport
Image source, BBC Sport
Image source, bbc sGareth Griffiths
BBC Sport Wales at Rodney Parade
It is the battle of the east now after Scarlets win the opening match.
Old school Rodney Parade slowly filling up. Will it be Cardiff Blues celebrating a third successive win or can the Dragons finally win a Welsh league derby at the 22nd attempt in a losing record stretching back to December 2014?
Scarlets 20-17 Ospreys
That's it, Scarlets have come through this epic encounter to beat Ospreys by three points at Parc y Scarlets. Ospreys could not make anything of their final attack as Alun Wyn Jones was turned over in his own 22, handing victory to the hosts.
Match report - Scarlets 20-17 Ospreys
Kieron Fonotia
Former Osprey Kieron Fonotia has been named Man of the Match. The centre has been everywhere today and will have enjoyed getting one over on his former side.
Image source, Huw Evans Picture AgencyScarlets 20-17 Ospreys
Scarlets captain Ken Owens has been replaced as the clock goes red. Ospreys have a try on their own five-yard line. They will need to go the length of the pitch if they are to get anything out of this game.
Scarlets 20-17 Ospreys
Scarlets have knocked it on, with just 35 seconds left on the clock!
Patchell is a yard away from sealing the win but in the resulting ruck a Scarlets pair of hands knocks the ball on and the Ospreys may have one last chance to salvage something.
Scarlets 20-17 Ospreys
Scarlets have the ball with two minutes left to play. The home fans are really getting behind their side now. Time for calm heads.
Scarlets 20-17 Ospreys
Scarlets are just five minutes away from extending their unbeaten home record in the league.
They last lost here to Munster in September 2016!
Scarlets 20-17 Ospreys
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Scarlets 20-17 Ospreys
Some strong words from the Scarlets bench as Ken Owens' decision to go to the corner does not pay off and the Ospreys clear their lines.
Scarlets 20-17 Ospreys
Just 10 minutes remaining at Parc y Scarlets. It's been a grueling and thrilling derby and it is still anyone's game. Who will hold their nerve?
Image source, Huw Evans Picture AgencyScarlets 20-17 Ospreys
Scarlets piling on the pressure once again. Ospreys conceding a number of penalties, a card may be on the way. Scarlets captain Ken Owens opts against the three points as the hosts instead go for the corner. Will they live to regret that decision?
Samson Lee replaced by Werner Kruger
A rapturous applause from Scarlets fans for Samon Lee as he's replaced by South African Werner Kruger. He’s put in a big shift this afternoon.
It’s nail biting stuff here. BBC Radio Wales commentator Rick O'Shea has almost lost his voice at Parc y Scarlets.
Luke Morgan
Hold on, I spoke too soon! Luke Morgan gets his try after being denied in the first half. The Ospreys' first real attack of the second half is rewarded with a try. Justin Tipuric bulldozing his way through defenders before offloading to Morgan who had to pace to get to the corner before being caught. Sam Davies' conversion is well wide so the Scarlets stay three points ahead.
Image source, Huw Evans Picture AgencyScarlets 20-12 Ospreys
Ospreys have let this game get away from them in the second half. There is still 20 minutes to get back into it, but that looks a tough task if the Scarlets keep this momentum going.
Rhys Patchell
It was coming. Rhys Patchell, back on the pitch after his HIA, crosses over after a long period of sustained Scarlets pressure to settle some of the nerves among the home supporters. Leigh Halfpenny converts to put the Scarlets two scores ahead,
Scarlets 13-12 Ospreys
The Scarlets smell blood, the Ospreys can't get their hands on the ball. They are defending for their lives at the moment as the phases keep racking up.