This depends on what you mean by "a ruling."
Umpires have always been free to consult with each other on who had the best view of a play. If one umpire makes on judgement (say, the runner was tagged out) and another umpire makes another one (the fielder missed the tag), the head umpire can make a decision on who had the best view of the play; and can then over-rule an original call.
Catchers can appeal to the umpire at first or second base on whether a batter "checked his swing." This will happen a few times every game.
Presently, umpires can CHOOSE to use TV replays to determine if a ball was (or was not) a home run. In this case, umpires might decide to overturn an initial call.
MLB Union rules state that an arbitator can overturn or reduce a suspension. This happens periodically.
the pine tar game is the only game ever overturned
Ever since Dec 1971. As of 2017, that's 46 years.
No..there is no such thing as a half-run in baseball.
no
that does't make sense
Dylan Axelrod
Darwin's theory of evolution is the foundation of biology, and not only has not been overturned in over 150 years, but enjoys ever broadening support from other scientific disciplines as well.
The game of baseball has been around since at least the early 1800s, and the rules have constantly been changing ever since then.
No
No
No Derek Jeter was never suspended from baseball
At some point in their past, many countries have had small areas where anarchy was the ruling system, but none have ever been completely run that way.