Hustles

Hustling is the deceptive act of disguising one's skill in a sport or game with the intent of luring someone of probably lesser skill into gambling (or gambling for higher than current stakes) with the hustler, as a form of both a confidence trick and match fixing. It is most commonly associated with, and originated in, pool (and to an extent other billiards-family games), but also can be performed with regard to other sports and gambling activities. Hustlers may also engage in "sharking"—distracting, disheartening, enraging, or even threatening their opponents—to throw them off. Hustlers are thus often called "pool sharks" (compare "card shark"). Professional and semi-pro hustlers sometimes work with a "stakehorse"—a person who provides the money for the hustler to bet with (and who may assist in the hustling)—in exchange for a substantial portion of all winnings. Another form of hustling (often engaged in by the same hustlers who use the skill-disguising technique) is challenging "marks" (swindle targets) to bet on trick shots that seem nearly impossible but at which the hustler is exceptionally skilled.

Pool hustlers use deception and misdirection in order to win cash from inexperienced players (or skilled players inexperienced with the world of hustling). A skilled hustler:

Many of these ploys can easily be mistaken for the honest faults of a less-than-exceptional player. The engendered doubt and uncertainty is what allows hustling to succeed, with the "faults" being dropped when a significant amount of money is at stake.

...
Wikipedia