Largest 1st week sales ever?

[Munkeh111]

I was wondering whether GTA IV had got this. I know it did it in the UK and it looks that way in the US with 3.6m as opposed to SA's 2.2m, but is there another game that I am not considering. Halo 3 got 2.8m in the US, so it beats the single platform, but overall GTA IV wins as far as I can tell