#3 Randy Orton
The possibility of a potential Randy Orton vs. Dominik Mysterio feud happening on WWE RAW is quite high.
Not only are both Superstars on the same brand, but Randy Orton just lost a WWE title match against Drew McIntyre at SummerSlam, and we still don't know whether there will be a rematch down the road.
Also, Orton has done some notorious things in recent memory, and Dominik has been on the receiving end of a brutal beatdown, thanks to Seth Rollins.
The Viper has proved himself to be one of the most despicable heels in WWE this year, and Dominik has the completely opposite personality.
It almost seems like both of them are destined to feud sometime down the road, and given the current state of things in WWE, Randy Orton could very well target Dominik Mysterio sooner than later.
Dominik and Orton have also been a part of some great story-based moments in recent memory, so a potential feud that pits them against each other is almost guaranteed to be an interesting program.