Edgy MD wrote: The season in which he uses up his rookie eligibility — by at-bats, innings pitched, or service time — is a rookie season. If he hits his 50th career inning pitched on April 1, he's a rookie. More importantly, I think I need to get through to MLB and get this vote tossed and recast. There was a player a few years ago who was hit by a pitch one appearance before he lost his rookie eligibility and missed the rest of the season. He won the next year, even though he was no longer a rookie by the second game he appeared in in April. So it would seem that you're eligible if you are a rookie when the season begins.