I'd say Russia

You just never know...it always depends of the surface and all, and for example there's a possibility that Russia plays on grass, and other than Dmitry, they don't really like it:(

It's tough to predict, considering we don't know the surfaces or teams the countries will put out. However, I feel that it will be either Russia or the US.

I'd exclude Australia, they've been quite lucky till now...They must still get some luck...

The most important thing is surface.