Marquart (-221) over Horn-large
I don't think I'd even pick a prime Horn over Marquart and now that Horn is shopworn, I definitely won't be doing so. I think he's just too physically weak and worn out to threaten Marquart.
Sylvia (+169) over Nogueira-medium
Tim will likely prove too difficult to take down and standing he should be able to either smother Nogueira in the clinch or box him on the outside.
Eastman (+199) over Martin-small
Martin will probably win, but they're both chinny punchers, so it's worth a small bet.
Tibau (+321) over Griffin-small
Again Griffin will likely win, but his fights are usually close and Tibau will be close to 185 come fight time, so it's worth a shot.
Nakamura (-241) over Emerson-small
Emerson has looked bad on the occasions that I've seen him. Nakamura will be debuting at 155, so I'm only going small on him.
I don't know what to make of Mir vs. Lesnar. I've never thought much of Mir even before his accident. His biggest win was over a mentally absent Sylvia. Instead of keeping the fight standing, Tim takes it to the ground and then watches as Mir blatantly and not quickly repositions himself for an armbar. His 2nd biggest win was probably over Dan Christensen or Wes Sims. His endurance has always been bad, which leads me to believe that he simply has poor endurance. If this fight goes past a couple of minutes, Mir is likely in trouble. However, with Lesnar's inexperience I'll be staying away.