The World Nine-ball Championships are held annually, and are sanctioned by the World Pool-Billiard Association.
Events have been held for boys and women, and for the main world championships since this time, with a girl's tournament being created in 2004.
From 2021, the main tournament became all inclusive once again, while the women's event was discontinued.
In 1999, two men's tournaments were held, with one being run by the World Pool Association, held in Spain, and the other not recognised, held in Wales and known as the 1999 World Pool Championship.
[1] However, both events were later recognised as official world championships for the year of 1999.