#2 Last Man Standing Match: Edge vs. Randy Orton

As mentioned with the six-pack challenge match, there either needs to be more matches on the same night as the Universal Championship match or some that will be longer than usual. A multi-woman match is one way to draw things out as is putting this personal Last Man Standing match on the first night.
This has arguably been the most anticipated and best done feud ever since the Royal Rumble concluded. There has been a new wrinkle added practically every week and each man has had the upper hand at various points. With Edge's return to the ring being a huge selling point for this year's Showcase of the Immortals, it should be used on Night 1 to draw in viewers.
Both men have hit their promos and actions out of the park. And with the WWE Championship match being another huge contest from RAW, there needs to be some splitting up of the Monday night bouts. For Night 1, this match and the Owens/Rollins bout works. For Night 2, the other major RAW showdowns like The Undertaker vs. AJ Styles and WWE title match can anchor the action on Sunday.