#1 Daniel Bryan Vs. Brock Lesnar (SummerSlam 2014)
If WrestleMania 30 is remembered for two things, it's Daniel Bryan finally becoming WWE World Heavyweight Champion, and Brock Lesnar shockingly becoming the one to break The Undertaker's undefeated winning streak.
As the company's two biggest stars, many fans expected the two to face off, and according to Dave Meltzer, the pair were scheduled to main event that year's SummerSlam for Bryan's world title.
Sadly, Bryan's neck problems resulted in him forfeiting the title and taken off the road. WWE had to change the plans, which in the end considering his neck situation was probably a blessing in disguise.
Instead, Brock demolished John Cena to claim the gold, whilst Bryan would have to wait until Survivor Series 2018 to finally get his hands on the Beast Incarnate.