Who can you really count as a rival? past and present. Kane? Doesn't even make sense anymore. Mankind? They had great matches but....... no cuban cigar. Triple H, how??? Edge?....how???? (part 2). Shawn Michaels, out of your choices HBK "could" be the right answer but that's....kind of by default. no disrespect to the Undertaker (ever) but Shawn Michaels is like the best ever. Anyone HBK had a series of matches with could probably say that Shawn Michaels was their most heated rivalry. Batista? I like the guy's demeanor personally but I'd really like to see Batista fight Brock Lesner. the point is the Undertaker hasn't really had any true rivals, ever. Think long and hard about this one.