The National Rugby League (NRL) is the top league of professional rugby league football clubs in Australasia. The NRL's main competition, called the Telstra Premiership (due to sponsorship from Telstra Corporation), is contested by sixteen teams, fifteen of which are based in Australia with one based in New Zealand. It is regarded as the world's elite rugby league championship and, per season, is the single most viewed and attended rugby football competition in the world.

The National Rugby League is the present-day embodiment of Australia's top-level domestic club competition, which in turn grew from Sydney's club competition, and which has been running continuously since 1908. The NRL formed in the aftermath of the 1990s' Super League war as a joint partnership between the sport's already-existing national governing body, the Australian Rugby League (ARL) and media giant News Corporation-controlled Super League, after both organisations ran premierships parallel to each other in 1997. The NRL Partnership was dissolved in February 2012, being replaced by the Australian Rugby League Commission, chaired by John Grant.

Sonny William 'Sonny Bill' Williams (born 3 August 1985) is a New Zealand rugby union player, heavyweight boxer and former rugby league player. He is only the second person to represent New Zealand in rugby union after first playing for the country in rugby league. In rugby union he usually plays as a centre. He is particularly known in rugby league and rugby union for his ability to offload the ball in the tackle and, in rugby league, for his shoulder charges.

He started his professional rugby league career with the Canterbury Bulldogs in the Australian NRL. In 2008 he controversially left the Bulldogs mid-season to play rugby union with French club Toulon. In 2010 Williams signed with the New Zealand Rugby Union in an ultimately successful bid to play for the All Blacks at the 2011 Rugby World Cup. He played for Canterbury in the 2010 ITM Cup before being selected for the All Blacks' end of year tour in 2010, making his debut against England at Twickenham. He played for the Crusaders in the 2011 season of Super Rugby and plays for the Chiefs in the 2012 Super Rugby season. He was a member of the All Blacks squad that won the 2011 Rugby World Cup.