[1] Phil Taylor was the defending champion, having won his sixth Grand Slam title by defeating Dave Chisnall 16–13 in the 2014 final.

[2] The 2015 edition saw several changes in the qualification criteria due to the Grand Slam of Darts being a PDC Order of Merit ranking tournament for the first time.

[4] Other notable things that happened in the tournament included Dave Chisnall hitting a nine-dart finish against Peter Wright in their group match, and BDO veteran Martin Adams making his first appearance at the event, after declining his invite every year since the tournament's inception in 2007.

At most 16 players could qualify through this method, where the position in the list depicts the priority of the qualification.

[8] Michael van Gerwen (1) Gary Anderson (2) Phil Taylor (3) Peter Wright (4) Adrian Lewis (5) Robert Thornton (6) James Wade (7) Ian White (8) Raymond van Barneveld Keegan Brown Dave Chisnall Kim Huybrechts Terry Jenkins Jelle Klaasen Michael Smith Rowby-John Rodriguez Steve Beaton Andy Boulton Jonny Clayton Robbie Green Wayne Jones Mervyn King Mark Webster Steve West Martin Adams Larry Butler Andy Fordham Michel van der Horst Scott Mitchell Mark Oosterhuis Martin Phillips Geert De Vos [8] [9] All matches first-to-5/best of 9 legs NB in Brackets: Number = Seeds; BDO = BDO Darts player; Q = Qualifier NB: P = Played; W = Won; L = Lost; LF = Legs for; LA = Legs against; +/− = Plus/minus record, in relation to legs; Average = 3-dart average; Pts = Points; Q = Qualified for K.O.