I have a theory that doubleheaders are more likely to end in a split than any two random games. If every game's a coin flip, then it would be a split 50% of the time. But between the winner of game 1 being more likely to burn their top bullpen arms, the game 1 loser trying extra hard to avoid a sweep, and the game 1 winner having a natural easing up after having a win banked away, I figured splits would happen well above 50% of the time.
I started trying to track it a couple years ago. In 2023 splits did happen quite a bit more often. Last year was a pretty even split. And so far this year, splits have only happened in 3 of 10 doubleheaders so far.
In conclusion, I've wasted a lot of my/my employer's time