4 possible finishes for The Undertaker and John Cena's match at Wrestlemania 

#2 Undertaker wins via Interference

Kane and The Undertaker

Although this scenario is highly unlikely, with Kane having nothing major to do at Wrestlemania, it is possible that the Big Red Monster interferes in the match to cost Cena the victory.

The two had an altercation on the previous episode of RAW where Kane chokeslammed Cena after the former 16-time World Champion called out The Undertaker. So it is not unlikely that Kane will come to the aid of his brother for his final match.

Another interesting possibility could be that both the Brothers retire at the same time after Wrestlemania, giving the fans a moment to remember.