#4 The Cleveland Browns
The Cleveland Browns might seem like a pretty easy opponent on the surface, but they are 6-6 and very capable of handing out a loss. You also have to consider the fact that the Las Vegas Raiders lost to The Bears, The Bengals, and the Giants, who are all lower-tiered teams. This doesn't prove that they will lose again, but it does show that the team can blow an easy win.
There is also the problem of the Cleveland Browns having a slightly better defense, which could make things difficult for Carr. One example of this is that the Browns have only allowed 100 rushing yards per game this season and are notorious for shutting down the ground game. That means Carr will have to shoulder the load in the air, and that could spell trouble.