#2. AJ Styles
AJ Styles is currently in a feud with Ricochet for the Intercontinental title, and unsurprisingly turned heel recently when he joined forces with The Club, Luke Gallows and Karl Anderson, to, sort of, revive his fortunes in WWE and have potentially exciting feuds.
One top Superstar that The Undertaker hasn't feuded with on WWE television is AJ Styles, who hasn't quite had the opportunity to face The Deadman since joining WWE in 2016.
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With Styles now a heel, and having the additional support of Gallows and Anderson with him everywhere, a feud between him and The Undertaker could be a very exciting one.
While we can't expect an exceptional wrestling match between the two, owing mainly to The Undertaker's age, I do believe that the feud as a whole could be memorable. This is a match worthy of being on a big PPV's card.