Andy Roddick could be number one if...
...the rest of the ATP was swallowed up by a parallel universe.
...he joined the Senior circuit where he could beat up on the likes of Wayne Ferreira and Todd Martin.
...he joined the WTA.
...if they reduced the draws of all US played tourneys to accommodate him and only him, thereby making him the winner of Indian Wells, Key Biscayne, Rogers Cup, Cincinnati and the US Open by default.
...the world was anything like Pat McEnroe's secret stash of Roddick fanfic.