#1 Roman Reigns vs Goldberg in Saudi Arabia
Because of the fact that Goldberg is not a full-time, active member of the WWE roster, the company and FOX officials may not want to have him hold SmackDown's top title until SummerSlam. He may drop the title at WrestleMania and go on a hiatus, for instance. It would make sense, if this happened, for him to return to WWE at around the time the company begins to prep up for their second Saudi Arabia visit of the year.
The Saudi Arabia pay-per-views feature several dream matches, thus it is likely that Roman Reigns vs Goldberg could happen in the Middle East later this year when Vince McMahon and co. host a pay-per-view in the kingdom of Saudi Arabia during November. Roman and Goldberg have a massive fan following in the Asian country, meaning they'd get a terrific reception as well.
It is no secret that Goldberg isn't likely to have a huge number of matches left in his career, so if he is to bow out sometime soon, a clash against Reigns would be an ideal way for him to end his time in the ring while also allowing Roman to stand tall.