"In baseball, an unassisted triple play occurs when a defensive player makes all three putouts by himself in one continuous play, without any teammates touching the ball (assist). In Major League Baseball (MLB), it is one of the rarest of individual feats, along with hitting four home runs in one game and the perfect game. During a span of over 65 seasons (June 1927 to September 1992), there was only one unassisted triple play in the major leagues, made in July 1968. Even "ordinary" (assisted) triple plays are fairly rare, occurring a few times per year. Specific conditions must be met for the play even to be possible. There must be no outs in the inning and at least two runners on base (usually only two) who can be running with the pitch, as in a hit and run. Finally, 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. Most unassisted triple plays have taken this form: the infielder catches a line drive (one out), steps on a base to double off a runner (two outs), and tags another runner on the runner's way to the next base (three outs) (almost universally, the "next base" is the same base on which the infielder stepped to record the second out.) Less frequently, the order of the last two putouts is switched. The feat has happened only 15 times in modern major league history, plus once in 1878 (which is disputed). By comparison, there have been 20 perfect games since 1870, including two in the 19th century. On 15 occasions a player has hit four home runs in a game, including twice in the 19th century." --Wikipedia. Ad from September 2011.