Roman Reigns Wins Intercontinental Title, Becomes a Grand Slam Champion

Roman Reigns defeated The Miz tonight on Raw to become the Intercontinental Champion and now a “Grand Slam” champion, winning the WWE Championship, a Tag Team Championship, Intercontinental Championship, and United States Championship.

He is the 9th wrestler to do that under the current format of championships (addition of the United States title and after the European and Hardcore titles became defunct). Other wrestlers who are Grand Slam champions under the current format are:

Kurt Angle
Eddie Guerrero
Edge
Big Show
The Miz
Daniel Bryan
Chris Jericho
Dean Ambrose

Wrestlers who have won every men’s title under the previous format (prior to the US title, including the European and/or Hardcore titles):

Shawn Michaels
Triple H
Kane
Chris Jericho
Kurt Angle
Eddie Guerrero
Rob Van Dam
Booker T
Jeff Hardy
JBL
Christian
Big Show

Check out more details on the Wikipedia page.