The fact that Bobby Hurley was even an NBA player puts me and everyone on this board to shame.
He was 6'0", 165 pounds, and had no discernible natural athleticism. (Though he did have a coach-dad, so his bball IQ was high.)
Goes off pure work ethic and knowledge of the game to become a 1st-team All-American, starting point guard for back-to-back NCAA champions, Final Four Most Outstanding Player, picked #7 in the draft.
Then one month into his rookie season, he gets in a horrific car accident and is nearly killed. A station wagon slammed into his car, he's thrown 100 feet into a ditch, suffers collapsed lungs, broken ribs, fractured shoulder blade, torn tendon in his knee, and
breaks his freaking back.
And he was back in the NBA by the time the next season started, though he never matched the ability he showed in those first 19 games his rookie season.
For him to come back from THAT and play 6 years in the NBA, at 6'0" and 165 pounds, always blew my mind. I don't care what his stats are - how the hell was he playing in the NBA?
Earl Boykins and Muggsy Bogues are on the list too, of course. I'll always remember Muggsy's perfect game (6-6 from the field, 4-4 from three, 8-8 from the line, 24 points, 6 assists, 0 turnovers.)
I think Paul Pierce is one of the most overachieving superstars in the league. He's 6'6", but otherwise has no special physical attributes, and he comes from a pretty humble background. Just worked his ass off to get better and better until he became a star, and eventually a champion.