Shawn Michaels will face undertaker at wrestlemania XXVI
At WrestleMania 1, The Undertaker did not wrestle anyone. The Undertaker wasn't in a WrestleMania match until WrestleMania VII (7).
No one knows that yet, but at WrestleMania 27, Triple H will face Undertaker.
Kane
The Undertaker is coming back to WrestleMania 32 to face Sting and then retire the day after WrestleMania.
Edge
john cena
Yes
Shawn Michaels
Triple H
Randy Orton
He will beat HBK at wrestlemania 26