#4 Brock Lesnar cashes in - causes a disqualification
This may be Baron Corbin's chance to become Universal Champion for the first time in his career, but Brock Lesnar has never much cared about anyone but himself. The former Champion destroyed Rollins on Raw but then refused to cash in his Money in the Bank contract on the Champion, instead insisting that he will cash it in on Friday.
This could be another way for WWE to get eyes on their product when they travel to Saudi Arabia, or Lesnar could actually appear just as Rollins is about to secure the victory over Baron Corbin and force the disqualification.
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Rollins would then be forced to fight off Lesnar as well, which would be much harder for the Champion than it was back at WrestleMania when it could be argued that he was in the shape of his career.