Baseball:
If your player started the game, the selection will stand, regardless of whether you took the Over or the Under. This includes circumstances where the player leaves due to injury, ejection, or substitution.
Football and Basketball:
In general, if your player played in the game, the selection stands and is graded normally — including when the player leaves due to ejection or substitution.
The exception is injury: if your player leaves with an injury in the first half and does not return, the selection may qualify for Injury Shield. See Injury Shield for how that works.
All Other Sports:
As long as your player played in the game, your selection will be graded, regardless of whether you took the Over or the Under. This includes circumstances where the player leaves due to injury, ejection, or substitution.