Referees to 23 May
The matches getting the most attention this weekend are the Finals of the Heineken and Amlin Challenge Cups and the semifinals of the Super 14. At those matches, the match officials will be most in the spotlight.
International
Rugby World Cup qualifier
Ukraine vs Romania in Stade Spartak in Kiev
Referee: Franck Maciello (France)
Assistant referees: Frédéric De Castro, Hervé Gilard
European Nations Cup
Norway vs Slovenia in Alesund
Referee: John Kulakovskis (Lithuania)
Friendly
Estonia vs Finland at Viimsi Staadion, Viimsi, Tallinn
Referee: tba
Asian 5 Nations
Japan vs Hong Kong at Prince Chichibu Stadium
Referee: Harry Mason (Singapore)
Assistant referees: Mohammad Azhar (Singapore), George Danapol
Korea vs Kazakhstan at Munhak Stadium
Referee: Taizo Hirayabashi (Japan)
Assistant referees: Taku Otsuka (Japan), Shuhei Kubo (Japan)
South American Championship
Round 3 - 19 May 2010
Paraguay vs Brazil
Referee: Felipe Balbontin (Chile)
Chile vs Uruguay
Referee: tba (Uruguay)
Phase 2
Round 1 - 21 May 2010
Argentina vs Uruguay
Referee: Jaime Vial (Chile)
Round 2 - Sunday, 23 May 2010
Chile vs Argentina
Referee: Gustavo Gerbasi (Uruguay)
Under-20
The Junior World Rugby Trophy kicks off in Moscow on Tuesday, 18 May.
Round 1
Italy vs Papua New Guinea at Fili Stadium
Referee: Marcin Zeszutek (Poland)
Assistant referees: Akihisa Aso (Japan), Igor Nikolaichuk (Russia)
Assessor: Gabriele Villari
Uruguay vs Romania at Slava Stadium
Referee: João Mourinha (Portugal)
Assistant referees: Gia Amirkhanashvili (Georgia), Andrew Karani (Kenya)
Assessor: Andy Clift
Canada vs Zimbabwe at Fili Stadium
Referee: Marius Mitrea (Italy)
Assistant referees: Napolioni Locoloco (Fiji), Igor Nikolaichuk (Russia)
Assessor: Gabriele Villari
Russia vs Japan at Slava Stadium
Referee: Mauro Rivera (Argentina)
Assistant referees: Andrew Karani (Kenya), Gia Amirkhanashvili (Georgia)
Assessor: Andy Clift
Round 2
Italy vs Romania at Slava Stadium
Referee: Mauro Rivera (Argentina)
Assistant referees: Andrew Karani (Kenya), Gia Amirkhanashvili (Georgia)
Assessor: Gabriele Villari
Uruguay vs Papua New Guinea at Fili Stadium
Referee: Akihisa Aso (Japan)
Assistant referees: Marius Mitrea (Italy), Igor Nikolaichuk (Russia)
Assessor: Andy Clift
Japan vs Zimbabwe at Fili Stadium
Referee: Napolioni Locoloco (Fiji)
Assistant referees: Marius Mitrea (Italy), Igor Nikolaichuk (Russia)
Assessor: Andy Clift
Russia vs Canada at Slava Stadium
Referee: João Mourinha (Portugal)
Assistant referees: Marcin Zeszutek (Poland), Andrew Karani (Kenya)
Assessor: Gabriele Villari
IRB Sevens Series
London is the venue for the second last round in the IRB's Sevens Series for 2010.
Referees: Stuart Berry (South Africa), Laurent Cordona (Argentina), JP Doyle (England), Greg Garner (England), Andrew McMenemy (Scotland), David Smortchevsky (Canada), Colin Stanley (Ireland)
Heineken Cup Final
Biarritz vs Toulouse
Referee: Wayne Barnes (England)
Assistant referees: Dave Pearson (England), Chris White (England)
Amlin Challenge Cup Final
Toulon vs Cardiff Blues
Referee: Alain Rolland (Ireland)
Assistant referees: Alan Lewis (Ireland), George Clancy (Ireland)
Super 14 semifinals
Bulls vs Crusaders at Orlando Stadium, Soweto
Referee: Stuart Dickinson
Assistant referees: Jonathan Kaplan, Reuben Rossouw
Television match official: Johann Meuwesen
Timekeeper: Albert Mocke
Stormers vs Waratahs at Newlands
Referee: Mark Lawrence
Assistant referees: Marius Jonker, Cobus Wessels
Assessor: Shaun Veldsman
Timekeeper: Paul Ackermann
Pacific Rugby Cup
18 May
Tau'uta Reds vs Savai'i Samoa at Prince Charles Park
Referee: Samuela Tuidraki (Fiji)
Assistant referees: James Bolabiu (Fiji), Laisa Kauyaca (Tonga)
Fiji Barbarians vs Upolu Samoa at Prince Charles Park
Referee: Mo'unga Va'a (Tonga)
Assistant referees: Feano Nonu (Tonga), Mikea Rohodrakia (Fiji)
Fiji Warriors vs Tautahi Gold at Prince Charles Park
Referee: Kalekilio Petelo (Samoa)
Assistant referees: Tui Komiti (Samoa), Petero Misaeli (Tonga)
22 May
Tautahi Gold vs Upolu Samoa at Lawaqa Park
Referee: James Bolabiu (Fiji)
Assistant referees: Samuela Tuidraki (Fiji), Laisa Kauyaca (Tonga)
Fiji Barbarians vs Savai'i Samoa at Lawaqa Park
Referee: Feo Nonu (Tonga)
Assistant referees: Mo'unga Va'a (Tonga), Nemia Bainivatu (Fiji)
Tau'uta Reds vs Fiji Warriors at Lawaqa Park
Referee: Tui Komiti (Samoa)
Assistant referees: Kalekilio Petelo (Samoa), Petero Misaeli (Tonga)
Domestic
Australia
New South Wales
TooheysNewCup Shute Shield
Randwick vs Northern Suburbs at Coogee Oval
Referee: Steve Hardy
Assistant referees: Neil Favager, Alex Richards
Coach: John McCarthy
Parramatta vs Warringah at Granville Park
Referee: Angus Gardner
Assistant referees: William Houston, Kevin Twomey
Coach: Peter Marshall
Manly vs Gordon at Manly Oval
Referee: James Scholtens
Assistant referees: Luke Colbron, Amy Perrett
Coach: Brendan Taylor
Penrith vs West Harbour at Nepean Rugby Park
Referee: Andrew Lees
Assistant referees: Tim Wills, Greg Butler
Coach: Frank Meiklejon
Sydney University vs Eastwood at University Oval No 1
Referee: Nathan Pearce
Assistant referees: Guy Grinham, Darren Bradley
Coach: Michael Tanzer
Eastern Suburbs vs Southern Districts at Woollahra Oval
Referee: James Leckie
Assistant referees: Craig Smith, Clinton Allardice
Coach: Wayne Erickson
Television match official: Matt Goddard
England
Championship Final - 1st leg
Exeter Chiefs vs Bristol at Sandy Park
Referee: Dave Pearson
County Championship
Cheshire vs Northumberland in Chester
Referee: Chris Sharp
Assistant referees: Brendan Fitzmaurice, Rob Sawyer
Cornwall vs Gloucestershire
Referee: Llyr Apgeraint-Roberts
Assistant referees: Andrew Bickle, Fred Spong
Eastern Counties vs Durham County in Sudbury
Referee: Ross Campbell
Assistant referees: Mark Liddell, Nick Carrick
Hampshire vs Somerset in Basingstoke
Referee: Mike Cooper
Assistant referees: Matt Carley, S Adams
Hertfordshire vs Devon at Old Albanian's RFC
Referee: Marcus Caton
Assistant referees: Richard Parker-Sedgemore, Dino Maddern
Kent vs Middlesex
Referee: Greg Macdonald
Assistant referees: Paul Kimber, Paul Burton
Warwickshire vs North Midlands
Referee: Nick Cockburn
Assistant referees: T Davis, Rhys Davies
Assessor: Steve Savage
Yorkshire vs Lancashire County in Huddersfield
Referee: Terry Hall
Assistant referees: A Jackson, Chris Seeley
Dorset & Wiltshire vs Oxfordshire
Referee: Luke Pearce
Assistant referees: Shane Cameron, Ian Pengelly
Leicestershire vs Cumbria
Referee: Andrew Vertigan
Assistant referees: T Griffiths, David Crooks
France
PRO D2 Final
The winner of this match will join Agen, the Pro D2 champions,. in the Top 14 next season.
Lyon vs La Rochelle at Stade Amédée-Domenech, Brive
Referee: Patrick Pechambert
Assistant referees: David Rosich, Akim Hadj Bachir
Assessor: André Corbin, Jean-Paul Grellety, Bernard Perez
Television match official: Gérard Borreani
USA
Rugby Super League semifinals
Life vs New York Athletic Club
Referee: Paul Bretz
San Francisco Golden Gate vs Boston
Referee: Tom Lyons
Wales
Premier League
Premier League Play Off
Swansea vs Newport
Referee: Tim Hayes
Saturday
Premier League Play Off Final
Neath vs Swansea or Newport
Referee: tba