#2. Match at Extreme Rules
Once Seth Rollins becomes a villain, he could have many showdowns against Styles leading up to Extreme Rules. They could beat the hell out of each other on RAW preceding Extreme Rules and then give us an excellent match at the PPV.
However, Rollins could once again get back to his sneaky tactics and win against Styles at Extreme Rules to retain the title, setting up an epic battle and conclusion for the second biggest PPV of WWE: SummerSlam.
#1. SummerSlam main event conclusion
At SummerSlam, the feud could be concluded with Styles winning the Universal Title after an epic match. By this time, Rollins will already have held the title for just a little over four months, so it would be the right time for the most prestigious RAW-based title to change hands.
And who better a Superstar to take the title off Rollins than AJ Styles?