#4. Seth Rollins
Seth Rollins is already the Intercontinental Champion as well as one-half of the RAW tag team champions; therefore, he has nothing to prove by winning the WWE World Cup. At the moment, it is safe to assume that most of Seth's attention is focused on Dean Ambrose who could possibly cost him a match which would automatically disqualify Seth from the rest of the tournament. In addition to Dean Ambrose, Seth also has to think about the fate of his championships.
Winning the World Cup would place a very large target on Seth's back, and at the moment I don't think he would benefit from the extra attention. Even if Seth doesn't win, the tournament has been set up in such a way that all his matches would be very entertaining. Seth's first match will be against Bobby Lashley, and it promises to be one of the most intense matches of the night.