High Quality Content by WIKIPEDIA articles! In baseball, an unassisted triple play occurs when a defensive player makes all three putouts by himself in one continuous play, without his teammates making any assists. Neal Ball was the first to achieve this in the MLB under modern rules, doing so on July 19, 1909. Certain conditions have to be met to make the execution of this rare play possible. There must be no outs in the inning and at least two runners on base in a force situation who run the instant a pitch is thrown. Furthermore, the batter must make excellent contact with the pitch, resulting in a line drive hit directly at an infielder, usually either the shortstop or second baseman.