**Baseball (single player): ** Charles “Victory” Faust. Faust approached John McGraw of the NY Giants saying that a fortune teller told him that he would win the pennant for the team. McGraw took him on as a mascot, and, eventually, once the pennant was clinched, put him into a couple of games. It appears that other teams were in on the joke – they let him steal second, third, and home once he reached first after being hit by the ball, and they probably went easy on him when he was pitching.
He ended up in a mental institution.
Baseball (entire team):
On May 18, 1912, Ty Cobb began serving a suspension for attacking a fan in the stands. The Detroit Tigers, his team, went on strike in support of Cobb.* Detroit had to field a team in order to avoid a forfeit and a $1000 fine, so they rounded up a group of players from the stands. The team consisted of: Billy Maharg (third base), Bill Leinhauser (outfielder), Dan McGarvey (outfielder), Jim McGarr (second base), Deacon McGuire (catcher), Pat Meaney (shortstop), Joe Sugden (first base), Allen Travers (pitcher), and Hap Ward (outfielder). McGuire was the only one with ML experience, but he was 48 and was a coach on the Tigers. Maharg was the only one to appear in another ML game – once with the Athletics a couple of years later.
The Athletics took it easy on their opponents, but still won the game 24-2.
Here’s the line score (I can’t find a box score).
DET A 0 0 0 0 2 0 0 0 0 - 2 4
PHI A 3 0 3 0 8 4 4 2 x - 24 25
Here’s a contemporaneous story. It was clearly the worst team ever fielded.
*The team thought Cobb was justified. The epithet that brought it one was, evidently, calling Cobb “half-nigger,” which caused Cobb to blow up because of what it implied about his mother.