#2 Sasha Banks
Talk about a slow burn heel turn. Sasha Banks has been on the verge of going over to the dark side for what feels like an eternity, helping Bayley to retain her Raw Women's Championship after initially being the one who helped her win it. She's also won a couple matches courtesy of cheating against the likes of Dana Brooke, so it's all adding up in terms of storytelling logic right now.
It seems odd to complete the turn at ‘Mania itself as opposed to before or after, but it would make Sasha the ultimate bad girl leading up to SummerSlam.
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You could have Bayley being on the verge of winning the belt only for Sasha to hit her with the title, knocking her out cold. The Boss pins her former best friend, lifts the title up high and sets us on a lovely collision course for the two to complete their trilogy of epic clashes.
You all know what's coming.