#2 Apollo Crews vs. Christian
One of the key reasons why Superstars of the modern era have not gained a massive fanbase is that they lose momentum when they are about to reach the top. Apollo Crews has the potential to become the next big thing in WWE, and a feud with Christian could give him the boost that he wants.
As mentioned ahead, the next two pay-per-view events of the company are bound to attract a lot of attention, and it would be fantastic if WWE books a feud between Christian and Apollo Crews for the United States Championship. The Canadian Superstar may likely battle Randy Orton at Extreme Rules, and may even lose to the Apex Predator.
However, he can show up on RAW, and say that the match against Orton has helped him find his former self. Later, he could hint that maybe he has one more title reign left in him before he departs, and then WWE can kickstart the storyline between Apollo Crews and Christian.
The two-time World Heavyweight Champion has never held the US title in his career, a statistic that would further raise the stakes for their SummerSlam match. A win over Christian can establish Crews as one of the most significant Superstars in WWE.
This is a massive 'if' as Christian has repeatedly told that he may never return to the ring, but if he does, he could perhaps put over a current Superstar who is looking to solidify himself