I don't understand why Kas is not here. He know very well with Petzchner and he has great start of season.
I think it's because the Germans had doubts about Mayer and Haas looked good in Australia, then they asked him to come.
And the Argentine double is not good anyway, then they can make a German team to beat them even without Kas.
Anyway the Argentines should win, but I'm surprised that some disrespect Kohlschreiber's abilities on clay, he's a good clay player.