Tomasso Ciampa vs Johnny Gargano
While AJ Styles vs Samoa Joe was the best rivalry in the main roster, the best WWE feud in 2018 belonged to former NXT tag team champions, Tomasso Ciampa and Johnny Gargano.
Ciampa returned from injury and hit Gargano, who was acknowledging the crowd after his NXT title match against Andrade Cien Almas at NXT Takeover: Philadelphia, on his back, and since then, the tension between the two increased and what resulted was a great feud that had the fans engaged in it throughout.
It had excellent storytelling, and the two matches that happened as a part of the feud were instant classics. It is high time that Raw and SmackDown Live should take a cue from NXT on how to build a rivalry.