#2 Christian Cage vs. CM Punk
CM Punk and Christian, now known as Christian Cage in AEW, didn't have a long storyline in WWE and wrestled each other a handful of times. Both of them were a part of the 2013 Money in the Bank ladder match, while their last singles match against each other came in 2012.
Cage recently won the IMPACT World Championship from Kenny Omega and became the first wrestler to defeat Omega in the last two years. Christian Cage vs. CM Punk is another dream feud that AEW fans will be hoping to see in the near future.
#1 Chris Jericho vs. CM Punk
CM Punk's most well-known rival from WWE currently in AEW is perhaps Chris Jericho. Jericho and Punk had a few memorable feuds, the most notable of them leading to a WrestleMania match in 2012.
CM Punk and Jericho faced each other for the WWE Championship at WrestleMania 28, where Punk retained the title.
The last singles match that Punk and Jericho had against each other came in 2013 at the Payback pay-per-view. AEW will surely run this feud once again when CM Punk joins the promotion.