Over the course of the last five years, both Georges St-Pierre and Anderson Silva have ruled their respective weight classes with an iron fist. Since joining the UFC roster, the dominant warriors have put together an unbelievable record of 29-1, which includes two title wins and 18 title defenses.
The sole loss during that period came when GSP fell to tremendous underdog Matt Serra in a fight that was later avenged at UFC 83.
At several moments in their mutual title reigns, Dana White and fans alike have openly spoke of their desire to see this superfight happen. With Silva's manager, Jorge Guimaraes, recently stating that GSP is the only fight that makes sense for The Spider, those talks are once again on the forefront of many fans.
St-Pierre has a trio of challengers that are staring him in the face upon his return from a 19-month layoff, so it appears that his dance card is full for the foreseeable future; however, it doesn't hurt to think about what could have been.
Here is a look at 20 superfights, past and present, that we wish we could see. Not all of these fights were obvious, nor were they all in hot demand, but each one represents a fight that could have had major implications on the MMA world as we know it.