#1. Brock Lesnar returns to interfere in the Universal Championship match at Extreme Rules
The only stipulated match as part of this year's Extreme Rules pay-per-view sees The Demon challenge Roman Reigns for the Universal Championship in an Extreme Rules match.
The fact that the match has no rules means that there is room for interference. The Usos will definitely try to include themselves in their cousin's match, whilst Paul Heyman will also be at ringside despite his recent issues with Reigns.
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The obvious route for WWE to take here is for Brock Lesnar to include himself in the match and send a message to Reigns ahead of their match at Crown Jewel.
An interesting swerve here would be if Lesnar made his return, F5'd Roman Reigns and then Finn Balor was able to cover him to become Champion. It could lead to a fantastic storyline if Lesnar inadvertently gave Balor the Universal Championship at Extreme Rules.