Fed will be number one, no doubt. He has one grand slam & a master series in the bag already. Nobody will stop him at Wimbledon, and there's only a small chance of an upset at the US - from then on, he has hardley any points to defend at paris and madrid.
Andy Murray - top 25 i'm thinking
Leyton Hewit - Hewitt didn't do much last year, he has little to defend so he should be back in the top 5. He started the year off bad, but 2 finals since then.
Andy Roddick - Top 15, players are figuring him out. It all comes down to the grass court season for him...