#1 Bobby Lashley vs Rusev
It's not a surprise that this tops the list, considering Bobby Lashley and Rusev have been having a rivalry for a while, and they might get the chance to trade blows at TLC.
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The feud began in the latter part of September when Lashley returned after a hiatus with Lana in tow. The storyline has progressed nicely over the past couple of months, but Rusev and Lashley are yet to have a singles match (although they did face off in a Tag Team match). An extra-marital storyline is not new in WWE, and this one has evoked mixed responses from the WWE Universe.
A normal match between the two seems too mundane as Rusev has been waiting for a long time to decimate Lashley, and a traditional TLC bout could allow the pair to deliver home a brutal match, doing justice to the lengthy storyline. Moreover, a gory match will keep the fans interested in this rivalry, allowing WWE to renew it further in the future if need be.