#2 Rey Mysterio
To my knowledge, Rey Mysterio and Roman Reigns have never gone one on one in singles action. This one is a true dream match. With the right opponent, Roman Reigns is an incredible performer and Mysterio certainly fits that category.
Mysterio is in the best shape of his career and has been putting in some fantastic performance on SmackDown Live. If Reigns returns, this one is a marquee match that is waiting.
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#1 Aleister Black
Former WWE NXT Champion, Aleister Black recently made his debut on RAW and SmackDown and definitely made an impression. Black has the ability, the charisma and what sets him apart even further is his character.
He has everything it takes to be a future WWE Champion and a great way to cement him as someone to keep an eye on would be a singles match against Roman Reigns - a former Royal Rumble winner and a 4-time world champion.