Teams qualify for the Grand Slam of Curling events by ranking among the top teams in the World Curling Tour's Order of Merit rankings. The top 10 to 15 teams are invited, with the number varying by event. Occasionally a lower-ranked team is invited through a sponsor exemption.
As of the 2014-2015 season, the Grand Slam of Curling consists of The Masters, The National, The Canadian Open of Curling, The Players' Championship and The Elite 10. The Masters and The National invite the top 14 men's and women's teams in the Order of Merit rankings. The Canadian Open invites the top 15 men's and women's teams. The Players' Championship invites the top 12 men's and women's teams. The Elite 10 invites the top 10 men's teams and does not include a women's competition. In the event that one of these teams declines an invitation, the next team in the Order of Merit rankings is invited. The Order of Merit rankings are updated every week and are mathematically determined based on teams' finishes in previous tournaments.
For The Masters, The National and The Canadian Open, the Grand Slam of Curling has the right to invite one men's team and one women's team through a sponsor exemption. This is the only exception to the rankings-based system; however, the exemption need not be used.