2006 WPA Men's World Nine-ball Championship

The WPA World Nine-ball Championship is an annual, international, professional nine-ball pool (pocket billiards) tournament, founded in 1990, sanctioned by the World Pool-Billiard Association (WPA), and principally sponsored and organised by Matchroom Sport (who provide the event's official website, under the less specific name World Pool Championship). It is divided into men's, women's and wheelchair Divisions. Since 2010, it is held in Doha, Qatar.

In the summer of 1989, the World Pool-Billiard Association (WPA) began plans for a world championship tournament. The group sent invitations, rules, sports regulations and by-laws. Reception was positive, and a provisional Board was created. These efforts culminated in February 1990.

In March 1990, the inaugural WPA World Nine-ball Championship was held in Bergheim, Germany. The playing field included 32 men and 16 women in separate divisions, and has since become an annual event. The event was organised solely by the WPA from this inauguration through 1999.

In July 1999, Matchroom Sport attempted to get involved with the organisation of the event, but their bid failed. The WPA event was played in Alicante, Spain, and won by Nick Varner of the United States. Broadcast on ESPN, it was the first pro nine-ball championship to be televised. Matchroom Sport, meanwhile, instead organised tournament called the "World Professional Pool Championship", a competing and non-WPA-sanctioned event in Cardiff, Wales, which was won by Efren Reyes of the Philippines.

In 2000, the Matchroom and WPA agreed that tournaments would merge into a single official world championship. The WPA also agreed to recognise the results of the 1999 Matchroom event, meaning that official listings show both Varner and Reyes as 1999 world champions. Matchroom changed its promotional name for the event to the "World Pool Championship", dropping the word "professional" from the title. The event remained in Cardiff through 2003.

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