4. Sin Cara (Azul) Vs. Sin Cara (Negro)
When Sin Cara returned after some time away in 2011, he returned with a newfound mean streak.
Gone was the fun-loving babyface, as this Sin Cara was much more aggressive, and wasn't afraid to break the rules.
Of course, this was because he was an impostor, and when confronted by the real Sin Cara, things got complicated.
To make matters easier, the fake Sin Cara changed to a black and red attire, becoming Sin Cara (Negro), Spanish for black.
After weeks of build, the two fought in a mask Vs. mask match on SmackDown, which saw the real Sin Cara win, with the impostor being unmasked, later becoming Hunico.
Interestingly though, after the original Sin Cara was released by the company, Hunico once again took up the mantle and wrestles as Sin Cara to this day.