#9 Shane McMahon vs. Kevin Owens
The rivalry between SmackDown Commissionaire Shane McMahon and Kevin Owens was a pretty long one, lasting just around 7 months. It even actually started while Owens was feuding with someone else, AJ Styles. KO was convinced that special referee Shane had screwed him out of his match with AJ at SummerSlam.
Owens demanded another shot at the United States Championship, but when Shane refused, Owens insulted Shane's children, which caused him to attack Owens. As a result, Shane was suspended and Mr. McMahon returned the following week to confront Owens and was met with a headbutt by the prizefighter, leading to a Hell in A Cell match between Owens and Shane at the same pay-per-view.
Owens defeated Shane in a sold Cell match following help from Sami Zayn. This lead to Sami and Daniel Bryan being inserted into the feud which carried on for several more months of serious tension and attacks that would eventually lead to a tag team match at WrestleMania between both teams where KO and Sami would be 'fired' if they lost. Shane and Bryan would come out on top, ending the feud.