Throughout NBA history, there have been many undersized players, although few have been able to drastically overcome their physical shortcomings.
This list, however, chronicles the players who did exactly that.
But before we can approach this topic, we must first lay out what it means, exactly, to be undersized.
First and foremost, one must recognize that the point guard and center positions are the most clearly defined positions in basketball—especially due to the prevalence of combo guards (PG-SG), wing players (SG-SF) and stretch forwards (SF-PF) in the NBA.
Consequently, true points are typically defined as perimeter-playing ball-distributors who are 6'0" or above, while centers generally stand, at the very least, 6'9" and play in the post.
And it is because of these somewhat-structured definitions that the NBA's undersized outliers most often stand out from the players in these two positions.
Nevertheless, there still have been some players who, despite playing among the muddled masses of the two, three or four, have managed to stand out as being both undersized and highly successful.
Therefore, the following 25 individuals are all players who were able to routinely outplay their taller foes, ranked using a combination of how well they performed and how physically outmatched they were.
(* to be considered undersized, point guards must be under 6'0" and centers under 6'9", but other position players will be judged subjectively)