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New Zealand
Fiji and new Zealand has won the most rugby sevens tournaments
New Zealand National Rugby Sevens Tournament was created in 1975.
Premiership Rugby Sevens Series was created in 2010.
England beat New Zealand 19-17 in the final.
Rugby League World Sevens was created in 1988.
Rugby World Cup Sevens was created in 1993.
The IRB Sevens is officially known as the HSBC Sevens world series and is a yearly series of international rugby sevens tournaments. Currently it consists of nine tornaments in eight countries.
Wales
Actually there is no difference. Its a name given to the top level of the professional game which indictaes the bast teams in the league which is made up of South Africa, New Zealand & Australia
once in rugby sevens
they play rugby union in the world cup and sevens rugby unions