#2 Kevin Owens vs. Samoa Joe
They never crossed paths outside the WWE at any point, as both men were in opposing promotions during their respective rise to prominence. However, when Samoa Joe first debuted in NXT, he came to the aid of Sami Zayn as Zayn was on the receiving end of an attack by Kevin Owens.
While a word or fists were never exchanged between the two, they came face-to-face, and in doing so teased the potential of an encounter. While both men are securely on opposing brands, and neither man has shown any ill will towards the other, that doesn't mean that if push came to shove things couldn't get heated between them.
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In the event that a match was to happen, they would be fighting for not only their own pride but the honor of the brand that they represent. If we look at their collective move sets, it is easy to see that a match between them wouldn't only be intense, but hard-hitting as well.