Flying under the radar of most Dodger fans is the fact that even though a rookie is called up to the major leagues as a September call-up, they can actually lose their rookie status for the following season if the have 130 plate appearances during their call-up.
Here’s the actual rule:
Determining rookie status:
A player shall be considered a rookie unless, during a previous season or seasons, he has (a) exceeded 130 at-bats or 50 innings pitched in the Major Leagues; or (b) accumulated more than 45 days on the active roster of a Major League club or clubs during the period of 25-player limit (excluding time in the military service and time on the disabled list).
Heading into today’s regular season finale against the San Diego Padres at Dodger Stadium, top shortstop/third base prospect Corey Seager has exactly 95 at-bats. So unless he has 35 at-bats today (which, of course, won’t happen), he will maintain his rookie status heading into next season when he will, in all likelihood, be a strong candidate in the 2016 National League Rookie of the Year race.
Godspeed to you Corey!