Zero
There are many opponents that Undertaker will be hard to win against but who he will find hard to beat is Rey Mysterio.
Nono
none
non
non
9
none times
Only once and that also by DQ!
at least twice cause Undertaker beat him twice
the rock triple h shawn michals ray mysterio batista the undertaker and many, many more
he has beaten undertaker 5 times
13