Dean Ambrose started at the top of the mountain after the WWE brand split a little over a year ago – retaining the championship belt for Smackdown. Since then, however, it has felt like he has been a little forgotten, while Seth Rollins has remained in the main event picture, and Roman Reigns continued to get one of the biggest continuous pushes in the WWE despite—or maybe because of—the awesome torrent of boos that rain down on him every time his music hits and he steps into the arena.
However, as of last Sunday night at SummerSlam 2017 in Brooklyn, NY Ambrose accomplished something that his former Shield partners haven’t, and he became the youngest WWE Superstar to ever do so. With the Ambrose and Rollins tag team victory at SummerSlam over Sheamus and Cesaro, they became Raw tag team champions and Dean Ambrose became a Grand Slam Champion!
The current criteria for the WWE Grand Slam are WWE Championship, Intercontinental Championship, United States Championship and the Tag Team Title—all of which Ambrose won at least once (he is a 2-time IC champ. The other titles he has won only once each).
This current Grand Slam requirement has only been in effect since 2015. Prior to that, the United States Championship was not recognized as part of the Grand Slam and instead you needed a European or Hardcore title to go along with the other three.
In its current incarnation, 'The Lunatic Fringe' became the eighth man to join the Grand Slam club, which also includes: Kurt Angle, Eddie Guerrero, Edge, Big Show, The Miz, Daniel Bryan, and Chris Jericho.
However, not only is Ambrose the first member of The Shield to become a Grand Slam champ, he is also the youngest ever to do so at the age of 31 years and 8 months. Which makes him just over 30 days younger than the Miz was when he joined the club with his IC title win back in 2012.
If we look at the Slam requirements prior to 2015, the men who make the list are Shawn Michaels, Triple H, Kane, Chris Jericho, Kurt Angle, Eddie Guerrero, Rob Van Dam, Booker T, Jeff Hardy, JBL, Christian, and Big Show.
And if we look at all 16 Grand Slam club members, Jeff Hardy was the youngest of them all. When he became a Grand Slam champ he was about 4-5 months younger than Ambrose was last Sunday.