#4 Natalya

Natalya is currently involved in a program with Ronda Rousey. Everyone expects these friends to turn into enemies at some point down the line, with Natalya turning back into a heel. This makes Natalya a natural choice to win the Money in the Bank contract.
Whether the turn happens beforehand or via a cash-in against Nia Jax, the briefcase would be an ideal vehicle to advance a feud with Ronda Rousey, ultimately transitioning the Raw Women's Championship on to her (which will likely come before WrestleMania, given that Charlotte is staying on SmackDown).
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It might not seem it, but Natalya honestly has the strongest chance.
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