#3 Rusev
The Bulgarian Brute is another solid option to take on Orton at WrestleMania, due to the fact that he is the current US Champion. We have seen Rusev and Orton have multiple matches before whether it was a singles bout or a multi-man bout, but whenever these two have crossed paths, it has always been Rusev as a heel and Orton as a face.
But now, the roles are clearly reversed due to the fact that Rusev is a babyface who is very over with the WWE Universe. These two have always been able to put on decent matches, so it would be intriguing to see how both superstars would fare in a match with different alignments.
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Orton has held the US Championship before, and with the WWE Championship being occupied by Daniel Bryan, who is also a heel, it seems highly unlikely that he will challenge for the belt any time soon. The Viper has always been a great option to dip into the upper mid-card or lower main event scene whenever needed.
With Lana also being back on Rusev's side, this could also be another good way to boost the rivalry between Rusev and Orton. You could have Orton attempt to flirt in a sinister way with Lana in an attempt to get into Rusev's head. After all, a heel Orton isn't shy when it comes to playing mind games at all.