The PDC Order of Merit is the world ranking system for professional darts players used by the Professional Darts Corporation (PDC), which ranks players according to the prize money won in PDC ranking tournaments. These world rankings are used to determine qualification and seeding for the televised ranking tournaments as well as the awarding of PDC Tour Cards at the end of the season. The Order of Merit format has been used since the 2007 PDC World Darts Championship, superseding the original PDC World Ranking system established in 1993, where points awarded for performances in tournaments according to their relative prestige. Upon the introduction of the rankings, the first player to hold the number one rank was Alan Warriner. Since 1993, twelve other players have held the top spot, including Luke Humphries, the current world number one. Alongside the main Order of Merit, the PDC also operate several secondary Orders of Merit which count prize money won on specific PDC Tours and may also offer qualification to specific televised events.