Fedor vs Chael: I think Chael is going to surprise many, and come out and try and stand with Fedor. After a minute or so of feeling each other out, both start throwing the haymakers. Fedor is the first one to land big. Chael immediately goes into panic wrestling mode. Fedor sprawls, lands a few more. Chael goes to mat, gives his back up to avoid being hit, and Fedor finishes him at the 3-minute mark of Rd 1.
Mitrione vs Bader: both fighters start by feeling each other out for a few minutes, throwing mostly ineffectual jabs and low kicks. After a few minutes, Bader pressures Mitrione, drops level and shoots, securing a td. Bader comes out in Rd 2 very aggressive, tries to bull rush Mitrione, and gets clipped with a straight right on the way in. Mitrione follows up with GNP en route to a tko stoppage in the first minute of Rd 2.
Fedor vs Mitrione II: both try to pick their shots in the first minute. After a minute or so, they both start throwing the haymakers. Fedor lands first this time, drops Mitrione, then follows him to the ground and finishes via tko stoppage. Fedor wins the Grand Prix.
Having said all that...any one of these fights are essentially coin flips. Though I'd put Fedor at about 2:1 favorite over Chael.