#4 Sami Zayn
Sami Zayn is the new heel in WWE. In 2016, after the brand split, he was not utilized properly in RAW and then he was shifted to SmackDown Live in the next minor Superstar Shakeup. He was being wasted as a babyface. Even after shifting to SmackDown, he wasn't utilized properly until he turned heel and joined his old friend cum foe, Kevin Owens.
Zayn received a major push after the heel turn because he got shifted from middle-card to main-event status. Since then, there is no turning back for Zayn. Zayn features in many main-event matches in Smackdown Live and he is also going to feature in the main-event of Fastlane. Last week on SmackDown Live, he turned against Kevin Owens and defeated him by giving him a Helluva-Kick right across his face.
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Zayn, an amazing wrestler and promo-cutter, has proved himself as an opportunist. For the past few months, he has got a great push, amazing crowd support and a massive chance to feature in main events. He, alongside Kevin Owens, has made the lives of many people (including Shane McMahon, Daniel Bryan) miserable.