It's crunch time in the Guinness Premiership as play-off permutations and European qualifications will be finally known for those in the hunt. Elsewhere, the Super 14 season enters its penultimate weekend before their own knockout stages take shape.
Magners League
Dragons vs Ospreys
Referee: Nigel Owens (Wales)
Munster vs Glasgow
Referee: tba (Wales)
Touch judges: Alan Rogan (Ireland), Brian Macneice (Ireland)
Television match official: Trevor Collins (Ireland)
Assessor: Bertie Smith (Ireland)
Scarlets vs Edinburgh
Referee: tba
Connacht vs Ospreys
Referee: Neil Paterson (Scotland)
Touch judges: David Wilkinson (Ireland), Mark Black (Ireland)
Assessor: John Sheehan (Ireland)
Ulster vs Cardiff Blues
Referee: Andy Macpherson (Scotland)
Touch judges: Eanna O'Dowd (Ireland), Mark Gargan (Ireland)
Assessor: Jack Young (Ireland)
Dragons vs Leinster
Referee: Peter Allan (Scotland)
Super 14
Round Thirteen
Friday, May 9
Hurricanes vs Western Force in Wellington
Referee: Jonathan Kaplan (South Africa)
Touch judges: Marius Jonker (South Africa), Bryce Lawrence (New Zealand)
Television match official: Gareth Williamson (New Zealand)
Assessor: Alan Riley (New Zealand)
Bulls vs Brumbies in Pretoria
Referee: Steve Walsh (New Zealand)
Touch judges: Vinny Munro (New Zealand), Craig Joubert (South Africa)
Television match official: Johann Meuwesen (South Africa)
Assessor: Dennis Immelman (South Africa)
Timekeeper: Gabriel Pappas (South Africa)
Saturday, May 10
Highlanders vs Blues in Dunedin
Referee: Chris Pollock (New Zealand)
Touch judges: Kelvin Deaker (New Zealand), Keith Brown (New Zealand)
Television match official: Shane McDermott (New Zealand)
Assessor: Stuart Beissel (New Zealand)
Reds vs Crusaders in Brisbane
Referee: Mark Lawrence (South Africa)
Touch judges: Petri Bosch (South Africa), Shaun Moore (Australia)
Television match official: Steve Leszczynski (Australia)
Assessor: Andrew Cole (Australia)
Sharks vs Cheetahs in Durban
Referee: Willie Roos (South Africa)
Touch judges: JC Fortuin (South Africa), Pro Legoete (South Africa)
Assessor: Michael Cupido (South Africa)
Assessor: Banks Yantolo (South Africa)
Timekeeper: Neville Heilbron (South Africa)
Lions vs Chiefs in Johannesburg
Referee: Stuart Dickinson (Australia)
Touch judges: Brett Bowden (Australia), Deon van Blommestein (South Africa)
Television match official: Johann Meuwesen (South Africa)
Assessor: Dennis Immelman (South Africa)
Timekeeper: Albert Mocke (South Africa)
Stormers vs Waratahs at Newlands
Referee: Lyndon Bray (New Zealand)
Touch judges: Brent Murray (New Zealand), Christie du Preez (South Africa)
Television match official: Shaun Veldsman (South Africa)
Assessor: Arrie Schoonwinkel (South Africa)
Timekeeper: Kat Swanepoel (South Africa)
Guinness Premiership
Gloucester vs Bath at Kingsholm
Referee: Dave Pearson
Touch judges: Peter Huckle, Stuart Terheege
Assessor: Ed Morrison
Television match official: Laurie Bryant, Graham Hughes
Leeds Carnegie vs London Wasps at Headingley Carnegie
Referee: Andrew Small
Touch judges: Alan Hughes, Don Helme
Assessor: Brian Campsall
Television match official: David Hudson
Leicester Tigers vs Harlequins at Welford Road
Referee: Wayne Barnes
Touch judges: Robin Goodliffe, Paul Dix
Assessor: Clive Leeke
Television match official: Brian Abrahams
Sale Sharks vs London Irish at Edgeley Park
Referee: Chris White
Touch judges: Paul Emerson, Martin Buck
Assessor: Colin High
Television match official: Andrew Turner
Saracens vs Bristol at Milton Keynes
Referee: Tim Wigglesworth
Touch judges: David Kurk, David Watson
Assessor: Paul Bridgman
Television match official: Bob Ockenden
Worcester Warriors vs Newcastle Falcons at Sixways
Referee: Dean Richards
Touch judges: Roger Baileff, Andrew Pearce
Assessor: Brian Leigh
Television match official: Matt Peters