#3 Braun Strowman is the Last Man Standing
Braun Strowman hasn't been seen since he was put on a stretcher and taken to a local medical facility in the second last episode of WWE Raw. While there have been reports concerning The Monster Among Men's health, the fact that he himself hasn't made an appearance means that his injuries could be just as bad as the company is pushing.
Strowman will appear at Extreme Rules but he won't be in very good shape which would give Lashley the full advantage. However, Strowman isn't a ordinary superstar and could still compete despite his injuries.
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Braun Strowman has been in Last Man Standing matches before and these matches have become something that he has become known for, so it's likely that he will be the victor to end this feud on Sunday night.