Sorry, I've been in Britain too long when I refer to Andy as Murray not Roddick! Roddick won his 1st and 2nd round matches in straight sets.
To be honest, I wouldn't be surprised if Murray lost because of the conditions. I don't know what they've been like in Melbourne but I do know that the on-court temperature during the tournament can get up to 140 degrees farenheit. Knowing his past physical problems, he may very well have succumbed to this. After all he is from Scotland, it don't get very hot there!
Matt