Pitcher prop and an early exit

MLB's rulebook decides what happens to the game; it says nothing about wagers. What happens to a bet is set by each sportsbook's own house rules, and they genuinely differ from book to book. Check the house rules of the book where the wager was placed. Books typically distinguish a starter who took the mound at all from one who never appeared, and some impose minimum-innings conditions on certain props — the exact threshold is per-book.

The game simply continues with a reliever — no MLB rule implication. This is purely a question of the book's conditions on pitcher props.

• Does any appearance by the pitcher make strikeout/outs-recorded props action?
• Are there minimum-innings or pitch-count conditions on pitcher props?
• Is an injury exit treated differently from a performance hook?

Posterior is verifying each major book’s current house rules for this scenario and will publish per-book answers with sources and check dates. We do not state a book’s policy until we have read it.