#2 Ronda Rousey vs. Charlotte Flair vs. Becky Lynch
Much like the Universal title match, everything about this one depends on how it ends. Becky Lynch has been the biggest story in WWE over the past year and this should be the culmination of that story. The work rate will be fine, but that doesn't matter nearly as much.
If Becky wins, the main event will be a success (especially if she taps out Ronda Rousey to do it). If she loses, the main event will be a catastrophe - not the best look for this "historic" occasion. I'm assuming that the right thing will happen, but you can never be sure in a company that loves "heat" and booking "swerves" for the sake of it.
#1 Daniel Bryan vs. Kofi Kingston
The main event it might not be, but this match has completely overshadowed everything else. Kofimania has been the best thing in WWE in 2018 so far. It will be more emotional than any other match on the card. Kofi Kingston is in much the same situation Daniel Bryan - the arrogant heel - was in five years ago.
This match will end with either another epic catharsis or an epic heartbreak. Either way, of all the matches on the card. This is the one you won't want to miss.