The only one of those losses that surprises me is Amer's
I think that Sweeting's result is surprising. Especially the score. I think he's a much more talented player than Zib. But, he's also very up and down.
Most of the Americans in the draw were either futures or challengers players... solid but not spectacular. Many of the really good Americans are in the main draw by DA or WC.
Still, it's a bit disheartening that it doesn't appear as though we have many up and coming Americans these days, especially when we used to have so very many top Americans in the days of McEnroe and such. Oh well.