#1 Leading to a match or a showdown at SummerSlam
SummerSlam is indeed the second biggest show of the year when all is said and done. WWE will want to make it a memorable affair and a surprise cameo from someone like Goldberg or indeed, Shawn Michaels can go a long way in doing this.
Ziggler could confront a whole horde of WWE Hall of Famers, ranging from Goldberg to Shawn Michaels and even Bret Hart, considering the show is in Canada, all of whom can take him down and have a blast at his expense. This is precisely the kind of programming that WWE has brought us in their big 4 pay-per-views.
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I can also imagine a Goldberg vs. Ziggler match even though there are rumors to the contrary doing the rounds currently. As with all Goldberg matches, it couldn't go long.
Plus, we all know just how well Ziggler sells big moves!