Over 62,000 supporters are expected for Saturdays Judgment Day double-header at the Principality Stadium as Cardiff Blues face the Ospreys and the Dragons tackle the Scarlets. Scott Williams makes his return from injury for the Scarlets while fellow Wales international Dan Lydiate is named at No 8 for the Ospreys.Cardiff Blues v Ospreys (2.30pm) Gareth Anscombe scored 18 points in Cardiffs victory over the Dragons earlier this month Cardiff are without Wales duo Lloyd Williams and Rhys Patchell after they failed to recover from the injuries suffered in their PRO12 win over the Dragons on April 17.Matthew Rees is preferred to Kristian Dacey at hooker while Josh Turnbull moves into the second row to accommodate Josh Navidis inclusion at No 8. The Ospreys thumped Treviso at the Liberty Stadium earlier this month The Ospreys have named Wales flanker Dan Lydiate at No 8 due to the injury-enforced absence of Dan Baker. Rhys Webb and Dan Biggar are named at half-back.Cardiff are seeking a fifth successive PRO12 victory for the first time since 2010 but the Ospreys have won all five of their previous appearances at the Principality Stadium.Cardiff Blues: 15 Dan Fish, 14 Aled Summerhill, 13 Garyn Smith, 12 Rey Lee-Lo, 11 Tom James, 10 Gareth Anscombe, 9 Lewis Jones; 1 Gethin Jenkins (c), 2 Matthew Rees, 3 Taufaao Filise, 4 Josh Turnbull, 5 James Down, 6 Sam Warburton, 7 Ellis Jenkins, 8 Josh Navidi.Replacements: 16 Kristian Dacey, 17 Brad Thyer, 18 Dillon Lewis, 19 Jarrad Hoeata, 20 Manoa Vosawai, 21 Tomos Williams, 22 Jarrod Evans, 23 Gavin Evans.Ospreys: 15 Dan Evans, 14 Hanno Dirksen, 13 Jonathan Spratt, 12 Owen Watkin, 11 Ben John, 10 Dan Biggar, 9 Rhys Webb (c); 1 Nicky Smith, 2 Scott Baldwin, 3 Dmitri Arhip, 4 Adam Beard, 5 Rynier Bernardo, 6 Olly Cracknell, 7 James King, 8 Dan Lydiate.Replacements: 16 Sam Parry, 17 Gareth Thomas, 18 Aaron Jarvis, 19 Rory Thornton, 20 Sam Underhill, 21 Brendon Leonard, 22 Sam Davies, 23 Josh Matavesi.Ulster v Leinster (3pm, live on Sky Sports 1 HD) Click here for full match preview.Ulster: 15 Jared Payne, 14 Andrew Trimble, 13 Luke Marshall, 12 Stuart McCloskey, 11 Craig Gilroy, 10 Paddy Jackson, 9 Ruan Pienaar; 1 Callum Black, 2 Rory Best (c), 3 Ricky Lutton, 4 Pete Browne, 5 Franco van der Merwe, 6 Iain Henderson, 7 Chris Henry, 8 Sean Reidy.Replacements: 16 Rob Herring, 17 Kyle McCall, 18 Andy Warwick, 19 Robbie Diack, 20 Roger Wilson, 21 Paul Marshall, 22 Stuart Olding, 23 Darren Cave.Leinster: 15 Rob Kearney, 14 Isa Nacewa (c), 13 Garry Ringrose, 12 Ben Teo, 11 Dave Kearney, 10 Johnny Sexton, 9 Luke McGrath; 1 Jack McGrath, 2 Richardt Strauss, 3 Tadhg Furlong, 4 Devin Toner, 5 Hayden Triggs, 6 Rhys Ruddock, 7 Josh van der Flier, 8 Jamie Heaslip.Replacements: 16 Sean Cronin, 17 Peter Dooley, 18 Mike Ross, 19 Mick Kearney, 20 Jordi Murphy, 21 Eoin Reddan, 22 Ian Madigan, 23 Luke Fitzgerald.Dragons v Scarlets (5pm) Scarlets suffered a heavy home defeat against Glasgow in round 20 Scott Williams makes his first appearance of the season for the Scarlets after recovering from the knee ligament injury suffered during the Rugby World Cup.Scrum-half Aled Davies replaces Gareth Davies and Michael Collins comes in at full-back as the Scarlets seek a victory that will keep their top-four hopes alive. A strong final quarter was not enough for the Dragons in their Challenge Cup semi-final loss to Montpellier Kingsley Jones makes three changes to the Dragons team that were beaten by Montpellier, with Angus OBrien and Charlie Davies forming a new half-back partnership.Centre Jack Dixon is promoted to the starting line-up in place of injured Tyler Morgan as the Dragons look to snap a three-game losing run at the Principality Stadium.Newport Gwent Dragons: 15 Carl Meyer, 14 Adam Hughes, 13 Adam Warren, 12 Jack Dixon, 11 Hallam Amos, 10 Angus OBrien, 9 Charlie Davies; 1 Phil Price, 2 Elliot Dee, 3 Brok Harris, 4 Rynard Landman, 5 Nick Crosswell, 6 Lewis Evans (c), 7 Nic Cudd, 8 Taulupe Faletau.Replacements: 16 Rhys Buckley, 17 Luke Garrett. 18 Lloyd Fairbrother, 19 Matthew Screech, 20 Ed Jackson, 21 Sarel Pretorius, 22 Dorian Jones, 23 Geraint Rhys Jones.Scarlets: 15 Michael Collins, 14 Liam Williams, 13 Hadleigh Parkes, 12 Scott Williams, 11 Steff Evans, 10 Steven Shingler, 9 Aled Davies; 1 Rob Evans, 2 Ken Owens (c), 3 Samson Lee, 4 Jake Ball, 5 David Bulbring, 6 Lewis Rawlins, 7 James Davies, 8 John Barclay.Replacements: 16 Ryan Elias, 17 Dylan Evans, 18 Peter Edwards, 19 Jack Condy, 20 Morgan Allen, 21 Gareth Davies, 22 Aled Thomas, 23 Gareth Owen. 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Helwani said that Weidman has been dealing with recurring swelling and pain in his knees related to torn meniscus he suffered as a teenager and the problems came to a head last week when he suffered prolonged swelling and pain in his left knee, resulting in the decision to undergo an arthroscopic scope procedure to clean up the tear in both knees.Renton, WA (SportsNetwork.com) - The Seattle Seahawks continue to take steps towards keeping their outstanding defense intact, with the reigning Super Bowl champions signing pass rusher Cliff Avril to a four-year extension on Friday. The move comes just one day after the Seahawks announced an agreement with linebacker K.J. Wright on a four-year, $27 million extension. Both Wright and Avril were slated to become unrestricted free agents at seasons end. According to NFL.com, Avrils new deal is worth $28.5 million and continues $16 million in guarantees. Avril signed a two-year contract with the Seahawks in March of 2013 and made an impact in his first season with the club, notching eight sacks and five forced fumbles over 15 reggular-season games.dddddddddddd. The veteran end has recorded 4 1/2 sacks and 20 tackles while starting all 14 contests this season. Cliff has been instrumental in what weve been building on the defensive side of the ball and we are excited that he?ll be with us for another four years, said Seahawks general manager John Schneider. He has been relentless in his approach to the game and his passion for winning is contagious. This is another great day for the Seahawks and the 12s. Avril spent his first five NFL seasons with Detroit prior to signing with the Seahawks. The 28-year-old amassed career bests of 11 sacks and six forced fumbles with the Lions in 2011, then registered 9 1/2 sacks the following year. ' ' '