I think Russia vs USA is going to be the first big test for the russian team in this tournament, yes they have been flying so far, but at the same time the USA, Brazil and Italy (the first 3 teams in this years WGP) were in the other draw, China was incredibly weak and all the other were medium level teams. On the other hand, the USA come from 2 defeats against the 2 other strongest teams in their draw (Brazil, Italy) and must be wanting to prove their game.
I honestly expect a coin toss result here in at least 4 sets