The prize fund increased to £400,000 for the 2009 edition of the tournament, an increase of £44,000 from the 2008 edition, £10,000 more for the runner up, £5,000 more for the semi finalists and £2,500 more for the quarter finalists. Players who failed to make it past the group stage in the last tournament got £4,000. However, players who finished 3rd would earn £1,000 more but players who finished bottom of a group would get £1,500 less. Also the player with the highest checkout would not be rewarded. Instead, the group winners would earn £2,500.
There were numerous tournaments that provided qualifying opportunities to players. Most tournaments offered a qualifying position for the winner and runner-up of the tournament, however the World Championships and the Grand Slams offers a place in the tournament to all semi-finalists. There are also various other ways of qualifying for overseas players, including those from Australia and the United States of America, as well as a wildcard qualifying event open to any darts player. Some minor changes were made to the qualifying criteria from 2008. The winner and the runner-up of the 2009 would be invited, whilst it was announced that only the winner of the 2008 Winmau World Masters would be invited (though runner-up Scott Waites was invited anyway due to the withdrawal of Martin Adams). It was also announced that the winner of the 2009 US Open would be invited, though this was later withdrawn from the qualification criteria.
Note: Players in italics had already qualified for the tournament.
* Scott Waites took the place of Martin Adams, who declined an invitation to the Grand Slam for the third year running. Following Adams' decision, the board of the Professional Darts Corporation met and decreed that he would not be invited to any future tournaments.
Simon Whitlock topped the Dart Players Australia Order of Merit, but had already secured his place in the Grand Slam as the 2008 BDO World Championship runner-up. Steve Macarthur, who came second, was not awarded an invitation.
The ITV Wildcard qualifier was held on 6 November 2009 at the Magnum Centre in Irvine, Scotland. Any darts player was able to enter and the winner received an invitation to the 2009 Grand Slam of Darts.
Steve Maish was the winner of the event, defeating Arron Monk in the final to secure the final place in the 2009 Grand Slam of Darts.
With Andy Hamilton and James Wade finishing level on points and leg difference, a nine-dart shootout between the two took place, to see who would play Terry Jenkins in the second round. The match took place after the conclusion of the group stages. The shootout occurred exactly one year to the day after a similar situation at the 2008 Grand Slam of Darts where Hamilton beat Alan Tabern.