#3 Brock Lesnar
Obviously Brock Lesnar has to cash in his Money in the Bank contract at some point, but we don't really know exactly when that will be. During Monday's Raw, the storyline was that Lesnar didn't know that he had an entire year to cash in his MITB contract, and because of that, his cash in could be held off until a big event like SummerSlam.
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But there is a chance that WWE gives Lesnar the next shot at the Universal Championship, but in a way where he doesn't have to cash in. Instead, he could be booked to lose the title match with Rollins, then after the match, he goes into a rage, destroys Rollins, and then decides to cash in and win the title after his loss.
So, don't be surprised if you see Brock Lesnar get the next shot at Rollins after the Super ShowDown card concludes.