When are rookies placed on the Waiver Wire?
Players will be listed on the ESPN Fantasy Baseball waiver/free agent list the morning after they are officially added to the team's 25-man roster (which is often the day after they play for the first time, since most big-league teams make the roster moves right before the start of the games.) Therefore, if you see a rookie make his debut, he will be in the player pool that next morning, if he is not already in it.

Before the season begins, ESPN may manually add without notice any player our experts believe has a legitimate shot at playing in the upcoming season, even if that rookie is not on the 40-man roster yet. When we do so, those players will show up, either in FA or on waivers.