In baseball, an unassisted triple play occurs when a defensive player makes all three outs by himself in one continuous play, without his teammates making any assists. Neal Ball was the first to achieve this in Major League Baseball (MLB) under modern rules, doing so on July 19, 1909. For this rare play to be possible there must be no outs in the inning and at least two runners on base, normally with the runners going on the pitch. An unassisted triple play usually consists of a hard line drive hit directly at an infielder for the first out, with that same fielder then able to double off one of the base runners and tag a second for the second and third outs.

William Adolf Wambsganss was an American second baseman in Major League Baseball. From 1914 through 1926, Wambsganss played for the Cleveland Indians, Boston Red Sox, and Philadelphia Athletics. He is best remembered for making one of the most spectacular defensive plays in World Series history, an unassisted triple play.