#3 Kevin Owens (WWE Tag Team Championship)
He may not have won a Championship in the past three years, but Kevin Owens has accomplished a lot in WWE. Despite this long drought, he has won six titles on the main roster. KO was even the top Champion on RAW, holding the Universal Championship in its early days back in 2016.
The former NXT Champion also won multiple United States and Intercontinental Championships, making him a regular in WWE's upper midcard scene. Owens only requires a Tag Team Title to join the illustrious group of Grand Slam Champions, but that may not be an easy task, especially for him.
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We know how well Owens has played with others, turning on many partners of his at will. Sami Zayn, Chris Jericho, and even The New Day have fallen for his devious ways. It is fair to say that his track record proves that he cannot be trusted, although KO has recently made several good friends in WWE and NXT as a babyface.
Kevin Owens has had temporary partnerships with Samoa Joe and Apollo Crews against common enemies, with neither of them lasting that long. But they showed that KO may have turned a corner and could be a trusted ally again. Once he returns to WWE, a tag title reign should not be far away. Perhaps, we could even see him reunite with his best friend, Sami Zayn.