#4 Jeff Hardy
Talking about the extremity levels that Dean Ambrose's wrestling arsenal had, a feud with the Charismatic Enigma, Jeff Hardy, would have been absolutely mesmerizing. Jeff Hardy was the maddest superstar of the Attitude Era who took unimaginable risks just for the sake of entertaining the WWE Universe.
He, along with Matt Hardy took the concept of Tables, Ladders and Chairs matches to the next level. Dean Ambrose also has had many memorable hardcore matches in his WWE career, with the TLC match against AJ Styles being the supreme one of them.
It is surprising that despite being on the same roster for almost a year, Dean Ambrose and Jeff Hardy never crossed paths. They had paired up together for tag team matches, when they were a part of the RAW tag team division and even once battled against each other in a tag team bout, also involving Seth Rollins and Matt Hardy.
But, the WWE Universe never got to see a singles match or a rivalry between Dean Ambrose and Jeff Hardy.