This is like the triple crown only you must hold all four titles, those being the World, Intercontinental, International, and World Tag Team Titles. No special order still and you don't have to win them at the same time, just hold each one at least once like the triple crown, but four instead of three making it harder to accomplish.
1. Shane "Daddy" Mack - July 21st, 2002
(Mack wins the Tag Team Titles with HBK to solidify him as a grand slam champ)
2. Viper - January 29th, 2006
(Viper wins the International Title to solidify him as a grand slam champ)
3. Whitney Marret - November 26th, 2006
(Whitney wins the International Title to solidify herself as a grand slam champ)
4. Michael McMoney - February 16th, 2008
(McMoney wins the Intercontinental Title to solidify himself as a grand slam champ)