#3 The Royal Rumble
Remember the pop Gregory Shane Helms aka The Hurricane got when he entered the Men's Royal Rumble Match in January of 2018, as the 21st Superstar? Well, even if you don't, a rather memorable spot during this year's Royal Rumble Match was John Cena's excellent depiction of shock, hilarity and sportsmanship -- as Cena welcomed The Hurricane like the sportsman he is, only to eliminate the superhero clad in his green suit and cape.
Long story short, Cena has always played an essential role, be it minuscule or huge, at the Royal Rumble PPV events. Speaking of which, this year, the WWE would be better off booking Cena in a singles match -- one that is prominently featured on the Royal Rumble PPV card -- against either Seth Rollins or Elias.
The best case scenario preceding this match would be if Cena loses a ladder match to Rollins or Elias, and then gets his revenge by going over clean in their singles match at the Royal Rumble PPV on January 27th, 2019...