This is really a surprise to see favourite in this one, these odds are influenced a lot by the fact that these two players have played recently and Cilic has ended in straight sets quite easy but have to mentionate that this is just another tournament and the situation is surely another as first of all Kohlschreiber is just the better player on clay than Cilic and his recently easy victory against the german man can't change the essential things, second I have to say that Kohlschreiber impressed a lot in his game against Nicolas Almagro, a lot of confidence in his play. Cilic has played three sets and there were many peiods of ups and downs in his play, no stability but this surely is no the basic reason for why we could confirm that he is not at his best as he has played just his first game. There are no doubts about Cilic's great success on faster surfaces but on clay Kohlschreiber is just one class over him and we have these great odds on the german man only because of the recent results which don't represent the reality.  Good Luck!