No. 1991.10.27 · Free Agency Era
Lonnie Smith Stops at Third
In a scoreless Game 7, Lonnie Smith was on first when Terry Pendleton doubled. A decoy at second base held Smith at third. He never scored.

Lonnie Smith with the St. Louis Cardinals in 1983. This is not the 1991 World Series baserunning play.
John Mena, CC BY 3.0, via English Wikipedia.
October 27, 1991, the Metrodome, Game 7 of the World Series. Jack Morris and John Smoltz had matched zeros into the eighth. Lonnie Smith led off with a single. Terry Pendleton drove the ball into the left-center gap, the kind of hit the Atlanta dugout greeted as a run. Smith was running on the pitch. Near second he slowed.
Chuck Knoblauch and Greg Gagne mimed the turn of a double play, as if the ball were on the infield. It was not. It was on the warning track. Smith said later that he had not picked the ball up and that the decoy fooled him. By the time he saw it, third was all he could reach. Ron Gant grounded out. David Justice walked. Sid Bream grounded into a 3-2-3 double play, Kent Hrbek to Brian Harper to Hrbek. The inning died with the run on third.
Morris finished ten shutout innings. In the bottom of the tenth Dan Gladden doubled, Knoblauch sacrificed, the Twins walked Kirby Puckett and Hrbek intentionally, and the injured Gene Larkin singled home the winner on the first pitch he saw from Alejandro Peña. Minnesota won, 1–0. Smith called it his mistake. The series is remembered as one of the best ever played. His hesitation is the reason it went to the tenth at all.
Film
Smith's baserunning miscue
Lonnie Smith loses track of the ball and stops at third on Terry Pendleton's double in Game 7.
Watch on MLB.comRelated entries

The Ball Gets Through Buckner
The Red Sox were one out from a title when a ground ball went through Bill Buckner's legs. By then the lead was already gone.
Boston Red Sox · New York Mets

Merkle's Boner
Fred Merkle, nineteen and starting in place of an injured regular, failed to touch second on a game-winning single. The league made the teams replay it, and the Cubs won the pennant.
New York Giants · Chicago Cubs
No. 2003.10.16
2003
Grady Little Leaves Pedro In
Boston led Game 7 of the 2003 ALCS by three runs. Grady Little visited the mound, left a tiring Pedro Martinez in, and the Yankees tied the game.
Boston Red Sox · New York Yankees