Kohli had to withdraw because of sickness, so Argentina has practicly won this tie
Is that for definite?
Horrible luck for Germany so far this season. They made a bold move to host the tie on clay (to eliminate Del Potro), but unfortunately the players are struggling for fitness at the worst possible time.
I'm doubtful about Mayer's groin. At full fitness, he'd potentially be a handful for the Argentines considering that he'd be playing on his favourite surface, and performed well on clay last season. However, I suppose that there would have been doubts about mental strength anyway.
As duong says, Kohlschreiber is capable of playing well on clay, and his form this season has been very good...confidence would be at its highest for a couple of years. Certainly dangerous, especially against Argentine #2 player.
I am very doubtful that Stebe could win a live singles this weekend. For me, the AO match against Hewitt gives a very good indication...talented player, but likely to struggle with stamina/nerves.
Haas shouldn't play singles...needs to conserve energy for doubles anyway.
Petzschner would really struggle imo. Nalbandian is a horrible match-up for him, and Monaco should grind him down.