#8 The Shield - No
Even though the list has individual superstars, I am including all three members of The Shield on the list considering how they are the future of the WWE. In fact, all three former members of The Shield are just one title away from completing the WWE Grandslam.
All three members of The Shield have captured the WWE/Universal Championship, but it is the secondary titles that keep them from capturing the Grandslam.
Dean Ambrose has won both the United States and Intercontinental titles but has never captured the tag team title. Roman Reigns and Seth Rollins -- who won the tag titles while they were part of the Shield -- have won the United States title, but not the Intercontinental title.
Expect the trio to close the deal in the near future, though.