#1 Shawn Michaels vs. Chris Jericho

Shawn Michaels and Chris Jericho had a very good rivalry in the build to WrestleMania 19, but when they revisited their issue in 2008, they took things to the next level. The issue between the two started organically with both as faces, and Jericho playing investigative journalist as he probed HBK retiring Ric Flair and then feigning injury to get the best of Batista.
Slowly, Y2J turned heel, leading up to a confrontation where he brutally beat Michaels senseless at The Great American Bash, and then accidentally punched Michaels’s wife at SummerSlam. The latter incident fueled Michaels destroying Jericho at Unforgiven, before the two would blow off their white-hot rivalry with the World Heavyweight Championship on the line in a Ladder Match at No Mercy.
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This rivalry was heated, captured the imagination of the fans, and resulted in great matches. You can throw a few bonus points its way, too, for a brief tag team reprisal as Michaels and Triple H worked under the DX banner to challenge Jericho and The Big Show for the tag titles the following year.