#1. Seth Rollins and Cesaro to finally conclude their rivalry on SmackDown

On the episode of Ding Dong Hello!, Seth Rollins was the special guest this week on SmackDown. Bayley and Rollins got along perfectly well, which shouldn't be surprising given how annoying both their characters are.
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The segment on SmackDown mainly involved the two complementing one another, but after Bayley played a highlight reel of Seth Rollins' beatdown on Cesaro, things changed. There was a ring on the doorbell, and as Rollins courteously went to open it, he found his rival The Swiss Cyborg waiting.
Cesaro returned to SmackDown and gave Seth Rollins a punch to the face before completely taking him out. That seems to be one match set for Hell in a Cell 2021, although it isn't confirmed just yet.
The logical place to conclude the feud would be Hell in a Cell. The two men have been going at it ever since Rollins' return to SmackDown, and it's finally time for things to come to a conclusion.