There's no denying the Undertaker's legacy. Mark Callaway has done everything asked of him in his twenty-five years in the WWE. The consummate pro, he has had to endure some pretty shabby treatment at the hands of the writing team and been given the task of wrestling some of the worst wrestlers to ever step in a WWE ring. That he did so willingly and without protest is a credit to The Undertaker's professionalism. There are many men of his stature who would have balked at having to not only wrestle, but also convincingly put over the likes of Giant Gonzalez, The Great Khali, Vladimir Kozlov and Mabel. Those matches are, invariably, not very good. Although 'Taker had had some bona fide classics over the years, he's also had some certifiable disasters. A lot of times it wasn't his fault: it was down to his lacklustre opponent, the restrictive nature of his gimmick or a silly stipulation. Sometimes, however, Undertaker is as much to blame for a match either not producing or completely falling apart as anyone else. Whether it's because he's injured, uninterested or simply not on his game, The Undertaker is not, despite his legendary status, the perfect wrestler. Even a superstar with the respect level of The Undertaker can have a shocker. Here are his 15 worst, seen by millions across the world on PPV.