May-June: Dolph Ziggler Loses The World Heavyweight Championship
This may have been the biggest mistake of 2013. With a concussion keeping him out, Ziggler took about a month off television as world champion. He would come back and become the good guy in a match with Alberto Del Rio. Instead of WWE building him into a main event guy, he would quickly lose the title in a match after missing Extreme Rules. There was no reason for him to lose the title. He was healthy. He even held the title when he was not healthy and that did not completely bury him. Losing the gold so quickly after one of the best cash-ins in WWE history buried Ziggler and he has yet to get back to where he should be.