A match between two bona fide WWE legends will always be remembered, but the outcome of this main event looks set to make history anyway.
On the one hand, you have the potential for Brock Lesnar to once again defeat Undertaker, perhaps closing the casket on one of wrestling's great characters. Make no mistake: There is every possibility that Lesnar will finish the job he started at WrestleMania 30 this coming Sunday.
At the same time, The Phenom could well put away The Beast Incarnate. That would see Lesnar's two-year reign of terror come to a crushing halt and would perhaps suggest that Undertaker is being prepped for one last run with a big win over such a potent figure.
Simply put, the result of this bout will shape the careers of both men. The future of both Lesnar and Undertaker will be decided by who comes out on top at SummerSlam.
WWE is pitting its two biggest special attractions outside of The Rock against one another. Fans aren't going to be satisfied by anything other than a decisive outcome, so it will be very interesting indeed to see which man gets the job done.
Either Lesnar or Undertaker will firmly establish himself as the man at the top of the WWE food chain. Both men could do great things in that position—but both would put a very different spin on the months to come.