#4 Mankind (Mick Foley) vs. Undertaker
When The Undertaker first debuted in the WWE, he was treated as an unstoppable force of supernature. His propensity for rising from the mat despite enduring tremendous punishment, as well as his obvious size and strength, often overwhelmed not just individual opponents, but entire stables of wrestlers.
Of course, no one retires undefeated, and there came a time when 'Taker would be humbled--repeatedly. The man who did the humbling was none other than hardcore legend Mick Foley as his Mankind character.
The two would engage in a series of brutal contests, which included many firsts for pro wrestling. They had the infamous Boiler Room Brawl match, in which the contest mostly took place backstage, and of course, they fought in the Hell in Cell match which featured the first through the roof bump in cage match history.
Mankind humanized the Undertaker and allowed him to evolve into a more complete character, while Undertaker's star power definitely helped make Foley's career.
Here is their brutal Hell in Cell Match, which is not for the squeamish!