Serra's last fight was GSP, and he tkoed GSP, in the first round.
I didn't make the odds for the fight, I made the odds for the tko/ko stuff.
If it were up to me the odds would be much closer for the fight.
But in regards to the ko/tko how would Serra be the underdog in the sense seeing his last fight he tkoed GSP in under 4 minutes.
If you don't like those odds don't bet on them.