People seem to be answering a different question to what the OP asked.
SVB has not won a single world championship hence can't seriously be included in the debate.
He may (or may not, depending on your opinion) be the most talented player this decade, the most consistent and probably the best US player.
But that wasn't the original question.
The player of the decade has to have stepped up on the World stage, not just in the US.
Shane has won four US Open titles in this decade....and it isn't over yet.
To me, that puts him in the running for player of the decade.