#3 The New Day
Although The New Day were very over during their time as Tag Team champions, there is no denying that in the last few months, people were dying to see them drop the titles. They finally did at Roadblock: End Of The Line on December last year, and they would still manage to keep themselves relevant after that.
Since there probably wasn't any plans for them at WrestleMania 33, they were made the hosts of the show, which they did a great job at. Soon after, they moved to SmackDown Live during the superstar shake-up and they seemed poised to be the top babyface tag team of the blue brand.
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They would go on to feud with The Usos in an absolute classic rivalry, putting on the match of the night with The Usos on a constant basis. Battleground, SummerSlam and Hell In A Cell were three PPVs where The New Day and The Usos stole the show like nobody's business.
The New Day seemed to gel as a unit so much better in 2017 and the matches they would put on increased to a new level. Although the hot potato between them and The Usos was criticised(similar to Sasha Banks and Charlotte Flair in 2016), there is no denying that the two teams brought the best out of each other.
Having captured the SmackDown Tag Team titles two times already, the 4-time champions will continue to impress and may likely have an even better 2019.