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Hi Scott, long time reader, first time e-mailer. I have a question for you and your good followers.
We are familiar with the WWE putting on the same match 3 or 4 PPVs in a row, but which match-up has featured on PPV the most times?
Off the top of my head I can think of Undertaker vs. Kane (excluding tag, multi man matches) at 9 times – WM XIV, Unforgiven 98, Judgement Day 98, Survivor Series 98, Sumer Slam 2000, WM XX, Night of Champions 2010, Hell in a Cell 2010, Bragging Rights 2010.
Any match-up beats this number?

Good question.  Orton v. Cena was featured in a few different forms, of course, but I don't think they hit nine.  Undertaker v. Austin had at least 5 off the top of my head.  Rock v. Austin were on six.  HHH v. Rock had a bunch during the 98-2000 prime.  The modern era has at least been remarkably good about mixing up different guys, or at least different combinations of the same few guys, to the point where it's not EXACTLY the same match over and over.