Originally Posted by goran_ace
As opposed to all those other former collegiate players who are tearing it up on the ATP? There are only 7 players in the year-end top 100 rankings who played college tennis, and other than Isner and Anderson just about all the others still have to play qualies to get into the main draw of a GS.
Top 100 basically assures you a main draw entry to a major's 128 man draw. That is the overall goal of Challenger level players: break into the top 100, hope for a favorable draw in a major, and get enough ATP points to start to get shots in the 250 & 500 draws or quallies.