It will be great if he wins RG. Depends a lot on Nadal's form, but I think Nole can give a very tough fight to even peak Rafa on clay.
Hmmm, no. Maybe he could have done it in 2011, but that chance is forever gone now. It can only happen if Rafa retires or gets soderlized again.
I will be happy if he defends AO, even if he doesn't win another title during the season.