#7 SD Tag Team Champions: The Usos

Finally, we get to a set of Champions that were at WrestleMania 34, in fact, they were the champions heading into WrestleMania last year as well.
The Usos, the current SmackDown Tag Team Champions, were set to defend their Smackdown Tag Team Titles against the New Day and Bludgeon Brothers in a triple threat tag team match. The match ended with the Bludgeon Brothers becoming the new SD Tag Team Champions.
#6 RAW Tag Team Champions: The Revival

Our current RAW Tag Team Champions, The Revival, as expected weren't a part of the main card of WrestleMania 34. They were hardly treated seriously last year around this time.
Though, they were a part of WrestleMania 34's pre-show card. Both Scott Dawson and Dash Wilder participated in the Andre the Giant Memorial Battle Royal. They ended up getting eliminated and eventually Matt Hardy won the match.