Federer is black ??? He must have had the same skin disorder as Jackson.
Right now its Federer, the guy doesn't loose. Tiger would be #2 because he does loose, finished second this last week.
Dominance throughout their career would be much tougher. The "Body of worth" argument could include Golf, but then it still would not be Tiger because he has not completed his career.
Lance and Sampras would be very close in my mind, both were the very best at their sport for long periods of time, Lance sat on top for seven years. Sampress was only "dominate" from '93-'97 with ten grand slam wins in that four year span time.
The problem with Lance, if he is always at the top, just how good was his compe ion? The same can be said for Sampras.
In my mind ... All time, Lance ... Now, Federer